| 单词 | spiral cell |
| 释义 | > as lemmasspiral cell a. Botany in spiral cell, spiral thickening, spiral tube, spiral vessel. ΚΠ 1832 J. Lindley Introd. Bot. 17 Spiral vessels..are membranous tubes with conical extremities; their inside being occupied by a fibre twisted spirally. 1837 P. Keith Bot. Lexicon 10 A revival of Grew's first opinion with regard to the function of the spiral tubes. 1861 R. Bentley Man. Bot. i. i. 15 In some cells the fibre forms an uninterrupted spiral from one end to the other..: such are termed spiral cells. 1884 F. O. Bower & D. H. Scott tr. H. A. de Bary Compar. Anat. Phanerogams & Ferns 157 This is the case in the closely-wound spiral tubes, which show transitional forms to the reticulate. 1933 Trop. Woods XXXVI. 4 Spiral Thickenings.—Helical ridges on the inner face of, and a part of, the secondary wall. 1953 K. Esau Plant Anat. xi. 228 Such secondary thickenings [of the xylem] are called, respectively, annular, spiral or helical, and reticulate. < as lemmas |
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