单词	Pisidium
释义	Pisidium noun Pi·​sid·​i·​um -ēəm : a genus of nearly cosmopolitan minute freshwater bivalves (family Sphaeriidae) usually somewhat smaller than those of the genus Sphaerium and having the siphons united at their ends Word History Etymology New Latin, diminutive of Latin pisum pea
随便看	reargument rearguments rearhorse rearhorses rearing rearise rearisen rearises rearising rearm rearmament serenity serenoae serenoas serer sereres serers seres serest serf serfage serfages serfdom serfdoms serfhood

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