| 释义 | ▪ I. trisect, a. Bot. rare.|ˈtraɪsɛkt|
[f. tri- + L. sect-us cut, as in palmatisect, pinnatisect.]
Of a leaf: Divided into three lobes quite to the base, but not articulated so as to form separate leaflets.
1899Heinig Gloss. Bot. Terms, Sect, completely divided from margin to midrib into distinct parts, in comp. as trisect.
▪ II. trisect, v.|traɪˈsɛkt|
[f. tri- + L. sect-, ppl. stem of secāre to cut, after bisect.]
trans. To divide into three equal parts (esp. in Geom.); sometimes gen. to divide into three parts.
1695W. Alingham Geom. Epit. 44 Trisect any side..in the points d and e. a1696Scarburgh Euclid (1705) 88 From hence 'tis manifest, how to trisect a Right angle. 1786Phil. Trans. LXXVI. 16 Mr. Graham..perceived.. how very much more easy a given line was to bisect than to trisect or quinquesect. 1822De Quincey Confess. 146 Could not I have reduced it a drop a day, or by adding water, have bisected or trisected a drop? 1876A. J. Evans Through Bosnia ii. 48 We found the dwelling-houses trisected into a sleeping-room, a kitchen, and a store-room.
Hence triˈsected ppl. a. (in Bot. = trisect a.); triˈsecting vbl. n.
1694Phil. Trans. XVIII. 70 So the halving, trisecting, quartering, &c. is performed by extracting the Square Root, the Cubick, Biquadratick Roots, &c. of the Terms. 1809Cavendish ibid. XCIX. 227 In trisecting, the greatest error we are liable to does not exceed that of bisection in a greater proportion than that of 4 to 3. 1828Webster, Trisected, divided into three equal parts. 1866Treas. Bot. 1174 Trisected, cut deeply into three parts. |
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