| 单词 | prothallus |
| 释义 | Word Frequency prothallus(prəʊˈθæləs) or prothallium (prəʊˈθælɪəm) nounWord forms: plural -li (-laɪ) or -lia (-lɪə) botany the small flat free-living gametophyte that bears the reproductive organs of ferns, horsetails, and club mosses. It is either a green disc on the soil surface or it is colourless and subterranean Derived forms prothallic (proˈthallic) or prothallial (proˈthallial) adjective Word origin C19: from New Latin, from pro- before + Greek thallos a young shoot |
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