| FID | flame ionization detector; free induction decay; fungal immunodiffusion |
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| ID | identification; iditol dehydrogenase; immunodeficiency; immunodiffusion; immunoglobulin deficiency; ... |
| IDP | immunodiffusion procedure; inflammatory demyelinating neuropathy; initial dose period; inosine dipho... |
| RID | radial immunodiffusion; remission-inducing drug; ruptured intervertebral disc |
| SRID | single radial immunodiffusion |
| Master's two-step exercise test | An early and long-used exercise challenge to identify ischemic heart disease using a pair of nine inch steps with a platform on top, the number of trips by the patient arbitrarily chosen and related to age and body weight. See: two-step exercise test. Synonym: Master's two-step exercise test. (05 Mar 2000) |
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| two | One and one; twice one. "Two great lights." . "Two black clouds." Two is often joined with other words, forming compounds signifying divided into, consisting of, or having, two parts, divisions, organs, or the like; as two-bladed, two-celled, two-eared, two-flowered, twohand, two-headed, two-horse, two-leafed or two-leaved, two-legged, two-lobed, two-masted, two-named, two-part, two-petaled, two-pronged, two-seeded, two-sided, two-story, two-stringed, two-foothed, two-valved, two-winged, and the like. One or two, a phrase often used indefinitely for a small number. Source: Websters Dictionary (01 Mar 1998) |
| two-bellied muscle | <anatomy> One of the suprahyoid group of muscles consisting of two bellies united by a central tendon which is connected to the body of the hyoid bone; origin, by posterior belly from the digastric groove medial to the mastoid process; insertion, by anterior belly into lower border of mandible near midline; action, elevates the hyoid when mandible is fixed; depresses the mandible when hyoid is fixed; nerve supply, posterior belly from facial, anterior belly by nerve to the mylohyoid from the mandibular division of trigeminal, a muscle with two fleshy bellies separated by a fibrous insertion. Synonym: musculus digastricus, biventer mandibulae, musculus biventer mandibulae, two-bellied muscle. (05 Mar 2000) |
| two-capsuled | <botany> Having two distinct capsules; bicapsular. Source: Websters Dictionary (01 Mar 1998) |
| two-carbon fragment | The acetyl group (CH3CO-) that takes part in transacetylation reactions with coenzyme A as carrier; commonly referred to as acetate or acetic acid, from which it is derived. (05 Mar 2000) |
| two-cleft | <botany> Divided about half way from the border to the base into two segments; bifid. Source: Websters Dictionary (01 Mar 1998) |
| two-component plasma | <radiobiology> Refers to a plasma containing a cool thermal component and a population of high energy particles (such as from neutral beam injection) which are in the process of thermalising (slowing down). (09 Oct 1997) |
| two-glass test | The urine, in a case of gonorrhoea, is passed into two glasses; if the gonococci and gonorrhoeal threads are found only in the first glass the probability is that the process is limited to the anterior urethra. Synonym: two-glass test. (05 Mar 2000) |
| two-hand | Employing two hangs; as, the two-hand alphabet. See Dactylology. Source: Websters Dictionary (01 Mar 1998) |
| two-handed | 1. Having two hands; often used as an epithet equivalent to large, stout, strong, or powerful. "Two-handed sway." 2. Used with both hands; as, a two-nanded sword. "That two-handed engine [the sword]" (Milton) 3. Using either hand equally well; ambidextrous. Source: Websters Dictionary (01 Mar 1998) |
| two-lipped | 1. Having two lips. 2. <botany> Divided in such a manner as to resemble the two lips when the mouth is more or less open; bilabiate. Source: Websters Dictionary (01 Mar 1998) |
| two-parted | <biology> Divided from the border to the base into two distinct parts; bipartite. <botany> Divided from the border to the base into two distinct parts; bipartite. Source: Websters Dictionary (01 Mar 1998) |
| two-ranked | <botany> Alternately disposed on exactly opposite sides of the stem so as to from two ranks; distichous. Source: Websters Dictionary (01 Mar 1998) |
| two-sided | 1. Having two sides only; hence, double-faced; hypocritical. 2. <biology> Symmetrical. Source: Websters Dictionary (01 Mar 1998) |
| two-step exercise test | A test used mainly for coronary insufficiency; significant depression of RS-T in the electrocardiogram is considered abnormal and suggests coronary insufficiency. (05 Mar 2000) |