pteridosperm
pteridosperm
[ˈtɛrɪdəʊspəːm]
noun
[ˈtɛrɪdəʊspəːm]
noun
- a fossil plant which is intermediate between the ferns and seed-bearing plants, dying out in the Triassic period
种子蕨。 亦称 seed fern - Formerly placed in their own taxon (class Pteridospermeae), but now included with the gymnosperms
旧时归入种子蕨纲，现归入裸子植物
- early 20th cent.: from modern Latin pteridospermeae, from Greek pteris, pterid- 'fern'
热门查询
- spectrometer n.分光计，分光仪,谱仪
- spectrometric adj.光谱测定的,度谱的,分光仪的,光谱仪的
- spectrometry n.光谱测定法，度谱术,谱测量
- spectrophone n.光谱测声器
- spectrophosphorimeter n.分光磷光光度计
- spectrophotoelectric adj.分光光电作用的
- spectrophotofluorometer n.荧光分光光度计
- spectrophotometer n.分光光度计
- spectropolarimeter n.分光偏振计
- spectroradiometer n.分光辐射度计
- spectroscope n.分光镜
- spectroscopic adj.分光镜的，借助分光镜的
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