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prostomium

英 [prəʊ'stəʊmɪəm] 美 [pro'stomiəm]

n. [无脊椎] 口前叶

英文词源

prostomium (n.): 1870, Latinized form of Greek prostomion "fore-mouth, something before the mouth," from pro "before" (see pro-) + stoma "mouth" (see stoma).