prostomiumn.
英 prəʊ'stəʊmɪəm | 美 pro'stomiəm
中文n. [无脊椎] 口前叶
词根词源
prostomium (n.)1870, Latinized form of Greek prostomion "fore-mouth, something before the mouth," from pro "before" (see pro-) + stoma "mouth" (see stoma).
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