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Meaning of sheathbill

sheath•bill

Pronunciation: (shēth'bil"), [key]
— n.
  1. either of two white sea birds, Chionis alba or C. minor, of the colder parts of the Southern Hemisphere: so called from the horny sheath covering the base of the upper bill.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.