impennes

from The Century Dictionary.

• A group of birds, the penguins. Also called Spheniscidæ and Spheniscomorphæ. Illiger. See Aptenodytidæ.

from the GNU version of the Collaborative International Dictionary of English.

• noun plural (Zoöl.) An order of birds, including only the penguins, in which the wings are without quills, and not suited for flight.