noun sheath·bill \ˈshēth-ˌbil\

Definition of SHEATHBILL

:  either of two white shorebirds (Chionis alba and C. minor of the family Chionididae) of colder parts of the southern hemisphere that have a horny sheath over the base of the upper mandible and suggest the pigeons in general appearance

First Known Use of SHEATHBILL

circa 1781


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