| triple bond | A covalent bond resulting from the sharing of three pairs of electrons; e.g., HC≡CH (acetylene). (05 Mar 2000) |
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| triple DNA | <molecular biology> A variation of DNA, in which there is a third strand of nucleotides binding to the first two by specific base pairing. (14 Nov 1997) |
| triple helix | The superhelix formed (right-handed) from three individual collagen helices (each being left-handed). (05 Mar 2000) |
| triple phosphate | Magnesium ammonium phosphate, MgNH4PO4, a crude phosphate fertiliser product from phosphate rock and phosphoric acid. Trisodium phosphate, Na3PO4;used to emulsify fats, oil, and grease; an irritant. (05 Mar 2000) |
| triple point | The temperature at which all three phases (i.e., solid, liquid, and gas) are in equilibrium; the triple point of water (273.16 K) is a fundamental fixed point in temperature scales. (05 Mar 2000) |
| triple response | <immunology> The vascular changes in the skin in response to mild mechanical injury, an outward spreading zone of reddening flare) followed rapidly by a weal (swelling) at the site of injury. Redness, heat and swelling, three of the cardinal signs of inflammation, are present. (18 Nov 1997) |
| triple rhythm | A triple cadence to the heart sounds at any heart rate, due to the easy audibility of a third (usually) or fourth heart sound, or at faster rates a summation sound due to coincidence of the third and fourth heart sounds. (05 Mar 2000) |
| triple symptom complex | <syndrome> A multisystem, chronic recurrent disease characterised by ulceration in the mouth and genitalia, iritis, uveitis, arthritis and thrombophlebitis. Often treated with immunosuppressive therapy (corticosteroids, chlorambucil). (27 Sep 1997) |
| triple-tail | <zoology> An edible fish (Lobotes Surinamensis) found in the warmer parts of all the oceans, and common on the southern and middle coasts of the United States. When living it is silvery gray, and becomes brown or blackish when dead. Its dorsal and anal fins are long, and extend back on each side of the tail. It has large silvery scales which are used in the manufacture of fancy work. Synonym:, locally, black perch, grouper, and flasher. Source: Websters Dictionary (01 Mar 1998) |
| triple vision | Visual defect in which three images of the same object are seen. Synonym: triple vision. Origin: G. Triploos, triple, + opsis, sight (05 Mar 2000) |
| triple X syndrome | <syndrome> In principle, the phenotypic features characteristic of trisomy of the X chromosome. Original observations (made in mental institutions) were seriously biased and the phenotypic changes spurious; now, even the remaining claim, that there is mild mental retardation, is suspect. The outstanding feature of the syndrome is the occurence of twin Barr bodies in a typical cell. (05 Mar 2000) |
| Flemming's triple stain | <technique> A stain comprised of safranin, methyl violet, and orange G. (05 Mar 2000) |