| triphyllous | <botany> Having three leaves; three-leaved. Origin: Gr.; (see Tri-) + a leaf: cf. F. Triphylle. Source: Websters Dictionary (01 Mar 1998) |
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| Tripier | Leon, French surgeon, 1842-1891. See: Tripier's amputation. (05 Mar 2000) |
| Tripier's amputation | A modification of Chopart's amputation, in that a part of the calcaneus is also removed. (05 Mar 2000) |
| tripinnate | <botany> Of leaves, pinnately divided three times. (09 Oct 1997) |
| tripinnatifid | <botany> Thrice pinnately cleft; said of a pinnatifid leaf when its segments are pinnatifid, and the subdivisions of these also are pinnatifid. Origin: Pref. Tri- + pinnatifid. Source: Websters Dictionary (01 Mar 1998) |
| triplant | See: triplant implant. (05 Mar 2000) |
| triplant implant | A combination of three pin implant's to form a single abutment to support or retain a dental prosthesis. (05 Mar 2000) |
| triple | 1. Consisting of three united; multiplied by three; threefold; as, a triple knot; a triple tie. "By thy triple shape as thou art seen." (Dryden) 2. Three times repeated; treble. See Treble. 3. One of three; third. Triple crown, the crown, or tiara, of the pope. See Tiara. Triple-expansion steam engine, a compound steam engine in which the same steam performs work in three cylinders successively. Triple measure, a measure of tree beats of which first only is accented. <mathematics> Triple ratio, that time in which each measure is divided into three equal parts. Triple valve, in an automatic air brake for railroad cars, the valve under each car, by means of which the brake is controlled by a change of pressure in the air pipe leading from the locomotive. Origin: L. Triplus; tri- (see Tri-) + -plus, as in duplus double: cf. F. Triple. See Double, and cf. Treble. Source: Websters Dictionary (01 Mar 1998) |
| triple bond | A covalent bond resulting from the sharing of three pairs of electrons; e.g., HC≡CH (acetylene). (05 Mar 2000) |
| 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) |