| 单词 | fern |
| 释义 | fern —fernless, adj. —fernlike, adj. /ferrn/, n. any seedless, nonflowering vascular plant of the class Filicinae, of tropical to temperate regions, characterized by true roots produced from a rhizome, triangular fronds that uncoil upward and have a branching vein system, and reproduction by spores contained in sporangia that appear as brown dots on the underside of the fronds. [bef. 900; ME ferne, OE fearn; c. G Farn fern, Skt parná feather] |
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