| 单词 | ray tracheid |
| 释义 | > as lemmasray tracheid ray tracheid n. ΚΠ 1903 Trans. Royal Soc. Canada 9 63 It thus appears that 33.3 per cent of the N[orth] A[merican] Coniferæ (genera) are wholly devoid of ray tracheids. 1956 F. W. Jane Struct. Wood v. 91 Ray tracheids often form the marginal cells of the rays. 2001 Ecol. Applic. 11 193/2 The presence or absence of fusiform rays, spiral thickenings, and ray tracheids were used to determine the species of otherwise indistinguishable woods. < as lemmas |
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