‖Ros‐trif″e‐ra (?), n. pl. [NL., fr. L. rostrum beak + ferre to bear.] (Zoöl.) A division of pectinibranchiate gastropods, having the head prolonged into a snout which is not retractile.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.