| 单词 | air canal |
| 释义 | > as lemmasair canal air canal n. a passage through which air can penetrate; (Botany) a continuous airspace in the stem, petiole, root, etc., of an aquatic or semiaquatic plant (cf. lacuna n. 2e). ΘΚΠ the world > plants > part of plant > leaf > petiole or leaf-stalk > [noun] > other parts of air canal1758 1758 T. Flloyd & J. Hill tr. J. Swammerdam Bk. Nature ii. vi. 109/2 They give little air canals [Du. lucht-ader; L. trachea], not only to the stomach but to all the external as well as internal parts of the body. 1857 A. Henfrey Elem. Course Bot. §734 Air-canals are long tubular channels, in petioles, or stems, bounded by a cellular wall. 1882 J. Scott & J. C. Morton Soil of Farm iv. 29 When the soil is drained, the superfluous water flows off through the air canals. 1995 Amer. Jrnl. Bot. 82 1345/1 Abundant air canals, round to hexagonal in cross section run parallel throughout the length of the root. < as lemmas |
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