Medical Dictionary

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ionone (i′o-non)
One of two cyclic terpene ketones with an odor of violets or cedar wood, the α and β varieties of which differ in the location of the double bond in the ring: provitamins A and vitamin A have i. configuration in the ring portion; α-carotene contains one α- and one β-i. moieties, β-carotene contains two β-i. moieties, and γ-carotene contains one β-i. moiety.

ionopherogram (i′on-o-fer′o-gram)
SYN: electropherogram.

ionophore (i-on′o-for)
A compound or substance that forms a complex with an ion and transports it across a membrane. [ion + G. phore, a bearer]

ionophoresis (i-on′o-for-e′sis)
SYN: electrophoresis. [ion + G. phoresis, a carrying]

ionophoretic (i-on′o-for-et′ik)
SYN: electrophoretic.

iontophoresis (i-on′to-for-e′sis)
The introduction into the tissues, by means of an electric current, of the ions of a chosen medicament. SYN: ionic medication, ionization (3) , iontotherapy. [ion + G. phoresis, a carrying]

iontophoretic (i-on′to-for-et′ik)
Relating to iontophoresis.

iontotherapy (i-on′to-thar′a-pe)
SYN: iontophoresis.

iopamidol (i′o-pam′i-dol)
A monomeric, nonionic, water-soluble, low osmolar radiographic contrast medium for urography or angiography.

iopanoic acid (i′o-pa-no′ik)
A water-insoluble radiographic contrast medium, once used widely for oral cholecystography. SYN: iodopanoic acid.

iopentol (i′o-pen′tol)
N,N′-Bis(2,3-dihydroxypropyl)-5-[N-(2-hydroxy-3-methoxypropyl) acetamido]-2,4,6-triiodoisophthalamide;a nonionic, monomeric, low osmolar radiographic contrast medium for intravenous urography or angiography.

iophendylate (i-o-fen′dil-at)
A mixture of isomers of ethyl iodophenylundecylate, an iodized fatty acid of low viscosity; used for radiography of the spinal canal. SYN: iodophendylate.

iophenoic acid (i′o-fen-o-ik)
SYN: iophenoxic acid.

iophenoxic acid (i′o-fen-oks′ik)
A radiographic contrast medium; formerly used for oral cholecystography. SYN: iophenoic acid.

iophobia (i-o-fo′be-a)
Morbid fear of poisons. [G. ios, poison, + phobos, fear]

iopromide (i-o′pro-mid)
N,N′-Bis(2,3-dihydroxy propyl)-2,4-6-triiodo-5-(2-methoxyacetamido)-N-methyl isophthalamide;a monomeric, nonionic, water-soluble, low osmolar radiographic contrast medium for intravenous urography or angiography.

iota (ι) (i-ot′a)
1. The ninth letter in the Greek alphabet. 2. In chemistry, denotes the ninth in a series, or the ninth atom from a carboxyl group or other functional group. 3. A tiny or minute amount.

iotacism (i-o′ta-sizm)
A speech defect marked by the frequent substitution of a long e sound (that of the Greek iota) for other vowels. [G. iota, the letter ι]

iothalamic acid (i′o-tha-lam′ik)
An ionic, monomeric, water-soluble radiographic contrast medium, widely used as the sodium or methylglucamine salt (iothalamate) for intravenous urography and angiography.

iothiouracil sodium (i′o-thi-o-ur′a-sil)
The sodium salt of 5-iodo-2-thiouracil; an organic iodine derivative of thiouracil with the thyroid-involuting action of iodine and the capability of inhibiting thyroxine production.

iotrol (i′o-trol)
SYN: iotrolan.

iotrolan (i-o′tro-lan)
5,5′-[Malonylbis(methylimino)]bis[N, N′-bis[2,3-dihydroxy-1-(hydroxymethyl)propyl]-2,4,6-triiodoisophthalamide];a dimeric, nonionic, water-soluble, low osmolar radiographic contrast medium, used for myelography and other nonvascular applications. SYN: iotrol.

ioversol (i-o-ver′sol)
N,N′-Bis(2,3-dihydroxypropyl)-5-[N-[2-hydroxyethyl)glycolamido]-2,4,6-triiodoisophthalamide;a water-soluble, nonionic, low osmolar, radiographic contrast medium.

ioxaglate (i-oks-ag′lat)
A diagnostic radiopaque medium, usually a combination of i. meglumine (C24H21I6N5O8&chmpnt;C7H17NO5), and i. sodium (C24H20I6N5NaO8); used in angiography, aortography, arteriography, venography, and urography.

ioxilan (i-oks′i-lan)
N-(2,3-Dihydroxypropyl)-5-[N(2,3-dihydroxypropyl)acetamido]-N′-(2-hydroxyethyl)-2,4,6-triiodoisophthalamide;a monomeric, nonionic, water-soluble, low osmolar radiographic contrast medium for urography or angiography.

ioxithalamate (i-oks-i-thal′a-mat)
5-Acetamido-2,4,6-triiodo-N-(2-hydroxyethyl)isophthalamic acid;an ionic, monomeric, water-soluble radiographic contrast medium for urography and angiography.

I.P., i.p.
Abbreviation for intraperitoneal or intraperitoneally; isoelectric point.

IP3
Abbreviation for inositol 1,4,5-trisphosphate.

IPA
Abbreviation for independent practice association; isopropyl alcohol.

ipecac (ip′e-kak)
SYN: ipecacuanha. powdered i. a form of i. used in the preparation of i. syrup.

ipecacuanha (ip-e-kak-u-an′a)
The dried root of Uragoga (Cephaelis) i. (family Rubiaceae), a shrub of Brazil and other parts of South America; contains emetine, cephaeline, emetamine, ipecacuanhic acid, psychotrine, and methylpsychotrine; has expectorant, emetic, and antidysenteric properties. SYN: ipecac. [native Brazilian word] de-emetinized i. i. from which the emetic principle has been extracted; has been used as an antidysenteric agent. prepared i. a fine powder to contain 2% of the total alkaloids of i., calculated as emetine.

IPF
Abbreviation for idiopathic pulmonary fibrosis or interstitial pulmonary fibrosis.

ipodate (i′po-dat)
A radiographic contrast medium, given orally as the sodium or, more often, the calcium salt, for opacification of the gallbladder and central biliary tree.

ipomea (i-po-me′a)
The dried root of Ipomoea orizabensis (family Convolvulaceae). SEE ALSO: i. resin. SYN: orizaba jalap root. [G. ips (ip-), a worm, + homoios, like]

Ipomoea (i-po-me′a)
A plant genus of the family Convolvulaceae including the morning glory. [L. ipomea] I. rubrocoerulea praecox the seeds contain lysergic acid amide, isolysergic acid amide, chanoclavine, elymoclavine, and other ergot (indole) alkaloids; ingestion of the seeds produces hallucinatory and euphoric effects. SYN: morning glory (1) . I. versicolor a species whose seeds contain hallucinogenic ergot (indole) alkaloids.

IPPB
Abbreviation for intermittent positive pressure breathing.

IPPV
Abbreviation for intermittent positive pressure ventilation.

ipratropium (i-pra-tro′pe-um)
A synthetic quaternary ammonium compound, chemically related to atropine, that has anticholinergic activity and is a bronchodilator given by inhalation.

iproniazid (i-pro-ni′a-zid)
An antituberculous and antidepressant agent similar to isoniazid, but more toxic and rarely used; it inhibits monoamine oxidase. The first antidepressant agent.

iproveratril (i-pro-ver′a-tril)
SYN: verapamil.

iPrSGal
Abbreviation for isopropylthiogalactoside.

Ips
Abbreviation for pipsyl.

ipsefact (ip′se-fakt)
All parts or aspects of the environment that an individual, colony, population, or species of animal has modified chemically or physically by its own behavior ( e.g., a nest or home, rodent or deer runs, excrement, pheromones). [L. ipse, self, + factum, a thing done]

ipsilateral (ip-si-lat′er-al)
On the same side, with reference to a given point, e.g., a dilated pupil on the same side as an extradural hematoma with contralateral limbs being paretic. SYN: homolateral. [L. ipse, same, + latus (later-), side]

IPSP
Abbreviation for inhibitory postsynaptic potential.

IPTG
Abbreviation for isopropylthiogalactoside.

IPV
Abbreviation for inactivated poliovirus vaccine. See poliovirus vaccines, under vaccine.

IQ
Abbreviation for intelligence quotient.

IR, ir
Abbreviation for infrared.

Ir
Symbol for iridium.

IRB
Abbreviation for institutional review board.

irid-
See irido-.

iridal (i′ri-dal, ir′i-dal)
Relating to the iris. SYN: iridial, iridian, iridic.

iridectomy (ir′i-dek′to-me)
1. Excision of a portion of the iris. 2. The hole in the iris produced by a surgical i.. [irido- + G. ektome, excision] buttonhole i. SYN: peripheral i.. optical i. i. performed for the purpose of improving vision by making an artificial pupil. peripheral i. in narrow-angle glaucoma, the surgical removal of a minute portion of the iris at its root; in intracapsular extraction of cataract, removal of one or more minute sections near the peripheral border, leaving the pupillary margin intact. SYN: buttonhole i., stenopeic i.. sector i. an i. in which a portion of the pupillary margin is excised. stenopeic i. SYN: peripheral i.. therapeutic i. an i. performed for the prevention or cure of disease, e.g., angle-closure glaucoma.

iridencleisis (ir′i-den-kli′sis)
The incarceration of a portion of the iris by corneoscleral incision in glaucoma to effect filtration between the anterior chamber and subconjunctival space. [irido- + G. enkleio, to shut in]

irideremia (ir′i-der-e′me′a, i′rid-)
Condition wherein the iris is so rudimentary as to appear to be absent. Cf.:aniridia. [irido- + G. eremia, absence]

irides (ir′i-dez)
Plural of iris. [G.]

iridescent (ir-i-des′ent)
Presenting multiple bright refractile colors, typically as a result of optical interference when incident white light is broken into its spectral components when reflected back through several thin-layered films. [G. iris, rainbow]

iridesis (i-rid′e-sis, i-ri-de′sis)
Ligature of a portion of the iris brought out through an incision in the cornea. [irido- + G. desis, a binding together]

iridial, iridian, iridic (i-rid′e-al; i-rid′e-an; i-rid′ik, i-rid′-)
SYN: iridal.

iridin (ir′i-din)
1. Irigenin 7-glucoside from orris root, Iris florentina. 2. A resinoid from blue flag, Iris versicolor; used as a cholagogue and cathartic. SYN: irisin.

iridium (Ir) (i-rid′e-um)
A white, silvery metallic element, atomic no. 77, atomic wt. 192.22; 192Ir is a radioisotope (half-life of 73.83 days) that has been used in the interstitial treatment of certain tumors. [L. iris, rainbow]

irido-, irid-
The iris. [G. iris (irid-), rainbow]

iridoavulsion (ir′i-do-a-vul′shun)
Avulsion, or tearing away, of the iris.

iridocele (ir′i-do-sel)
Herniation of a portion of the iris through a corneal defect. [irido- + G. kele, hernia]

iridochoroiditis (ir′i-do-ko-roy-di′tis)
Inflammation of both iris and choroid.

iridocoloboma (ir′i-do-ko-lo-bo′ma)
A coloboma or congenital defect of the iris. [irido- + G. koloboma, coloboma]

iridocorneal (ir′i-do-kor′ne-al)
Relating to the iris and the cornea.

iridocyclectomy (ir′i-do-si-klek′to-me)
Removal of the iris and ciliary body for excision of a tumor. [irido- + G. kyklos, circle (ciliary body), + ektome, excision]

iridocyclitis (ir′i-do-si-kli′tis)
Inflammation of both iris and ciliary body. SEE ALSO: iritis, uveitis. [irido- + G. kyklos, circle (ciliary body), + -itis, inflammation] i. septica SYN: Behçet syndrome.

iridocyclochoroiditis (ir′i-do-si′klo-ko-royd-i′tis)
Inflammation of the iris, involving the ciliary body and the choroid.

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