GNU Collaborative International Dictionary of English

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1.       
   Proleg , n. [Pref. pro- for, in place of + leg.] (Zool.) One of the fleshy legs found on the abdominal segments of the larvæ of Lepidoptera, sawflies, and some other insects. Those of Lepidoptera have a circle of hooks. Called also proped, propleg, and falseleg.
   1913 Webster