‖Im‐pen″nes (?), n. pl. [NL., fr. L. pref. im- not + penna feather.] (Zoöl.) An order of birds, including only the penguins, in which the wings are without quills, and not suited for flight.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.