资料来源 : Webster's Revised Unabridged Dictionary (1913)

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.