| 单词 |
midrib |
| 释义 |
midrib|ˈmɪdrɪb|
[f. mid a. + rib.]
†1. In phrase mid-rib deep, up to the middle of the ribs (of a horse). Obs.
1696Phil. Trans. XIX. 350 Nets trailed on the Ground by two Horses, one goeth Mid-rib deep into the Sea. 1807P. Gass Jrnl. 236 A north branch..is 40 yards wide and was mid-rib deep on our horses.
2. a. Bot. A principal rib continuous with the petiole extending through the central part of the blade of a leaf.
1776–96Withering Brit. Plants (ed. 3) II. 91 Scales spear⁓shaped, skinny, yellow, with a green midrib. 1794in Martyn Lang. Bot. 1884Bower & Scott De Bary's Phaner. 445 The petiole and midrib of the leaves. 1901Chambers's Jrnl. May 301/2 The leaves are thoroughly dried. In testing their dryness the mid-rib or vein should not be overlooked. 1965K. Esau Plant Anat. (ed. 2) xvi. 434 In some large grasses the median part of the blade is thickened into a midrib. 1974Country Life 7 Mar. 479/2 Gracillimus has narrow leaves with a silver mid⁓rib.
b. Archæol. A structure similar to the principal rib or vein of a leaf.
1929V. G. Childe Danube in Prehist. 126 Kite-shaped daggers with rivet-holes and a rudimentary midrib. 1938Proc. Prehist. Soc. IV. 283 Three flanged axes were found with a tanged spearhead with short blade and pronounced mid-rib.
3. Bee-keeping (see quot.).
1884J. Phin Dict. Apiculture Introd. 13 The word midrib has been used to denote the septum or partition between the two sheets of cells which are found in every comb. |
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