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| pro·sto·mi·um [ prō stṓmee əm ] (plural pro·sto·mi·a [ prō stṓmee ə ]) |
noun |
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| Definition: |
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part of worm's head: the part of the head of some worms such as the earthworm that is in front of the mouth
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| [Late 19th century. Via modern Latin< Greek prostomion "something in front of the mouth" < stoma "mouth"] |
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 pros·to·mi·al adjective |
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