‖n. pl. [ NL., fr. L. pref. im- not + penna feather. ] (Zool.) An order of birds, including only the penguins, in which the wings are without quills, and not suited for flight. [ 1913 Webster ]
‖n. pl. [ NL., from L. longus long + penna wing. ] (Zool.) A group of longwinged sea birds, including the gulls, petrels, etc. [ 1913 Webster ]
n. The quality or state of being open. [ 1913 Webster ]
a.
n.