ibis

noun, plural i·bis·es, (especially collectively) i·bis.

1. any of several large wading birds of the family Threskiornithidae, of warm temperate and tropical regions, related to the herons and storks, and characterized by a long, thin, downward-curved bill.Compare sacred ibis.
2. any of certain similar birds belonging to the stork family Ciconiidae, especially the wood stork, Mycteria americana.

noun plural ibises or ibis

1. any of various wading birds of the family Threskiornithidae, such as Threskiornis aethiopica (sacred ibis), that occur in warm regions and have a long thin down-curved bill: order Ciconiiformes (herons, storks, etc)Compare wood ibis

n.

stork-like bird, late 14c., from Greek ibis, from Egyptian hab, a sacred bird of Egypt.