单词 | pneumatophore |
释义 | Word Frequency pneumatophore(njuːˈmætəʊˌfɔː) noun 1. a specialized root of certain swamp plants, such as the mangrove, that branches upwards, rising above ground, and undergoes gaseous exchange with the atmosphere 2. a polyp in coelenterates of the order Siphonophora, such as the Portuguese man-of-war, that is specialized as a float |
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