Hypertext Webster Gateway: "Impennes"
From Webster's Revised Unabridged Dictionary (1913) (web1913)
Impennes \Im*pen"nes\, n. pl. [NL., fr. L. pref. im- not + penna
feather.] (Zo["o]l.)
An order of birds, including only the penguins, in which the
wings are without quills, and not suited for flight.
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