| 单词 |
rhizoid |
| 释义 |
rhizoid, a. and n. Bot.|ˈraɪzɔɪd|
[f. Gr. ῥίζα root + -oid.]
A. adj. Resembling a root. rare—0.
1858Mayne Expos. Lex., Rhizoides,..resembling a root; rhizoid. 1866Treas. Bot. 974/1.
B. n. A delicate root-like structure on the underside of many lower plants.
1875Bennett & Dyer tr. Sachs' Bot. 317 The Root-hairs (Rhizoids) play an..important part in the Economy of Mosses. Ibid., In Atrichum and other Polytrichaceæ, the stouter rhizoids coil round one another. 1914M. Drummond tr. Haberlandt's Physiol. Plant Anat. v. 226 The trichomes in question..are endowed with the properties of typical root-hairs, but in addition possess many of the capacities of roots; in particular, rhizoids agree with roots in being sensitive to the influence of light, gravity and moisture, whereas genuine root-hairs are quite free from these forms of irritability. 1952J. Clegg Freshwater Life iv. 88 Stoneworts have no roots in the strict botanical sense, but root-like structures, or rhizoids, penetrate the mud and serve to anchor the plants. 1965Bell & Coombe tr. Strasburger's Textbk. Bot. 70 Roots are lacking in the Bryophyta, but in their place most possess delicate rhizoids. 1977[see rhizine].
So rhiˈzoidal, rhiˈzoideous adjs., root-like; also, of the nature of a rhizoid.
1866Treas. Bot., Rhizoid, or Rhizoideous, resembling a root. 1875Bennett & Dyer tr. Sachs' Bot. 282 The rhizoidal tubes are segmented by only a few septa which lie far below the growing apex. |
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