| 单词 | seed fern |
| 释义 | seed fern in British Englishnoun another name for pteridosperm seed fern in American English any of an extinct class (Pteridospermae) of Paleozoic, fernlike cycads that bore naked seeds upon their leaves seed fern in American Englishnoun any of various plants of the order Lyginopteridales (or Cycadofilicales), known onlyas fossils, having fernlike leaves and reproducing by means of seeds Also called: pteridosperm Word origin [1925–30]This word is first recorded in the period 1925–30. Other words that entered Englishat around the same time include: buildup, distinctive feature, hot spot, recycle, reflex camera |
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