'Ibis' definitions:

Definition of 'ibis'

noun

Wading birds of warm regions having long slender down- curved bills

From: GCIDE

Ibis \I"bis\, n. [L. ibis, Gr. ?; of Egyptian origin.] (Zool.) Any bird of the genus Ibis and several allied genera, of the family Ibid[ae], inhabiting both the Old World and the New. Numerous species are known. They are large, wading birds, having a long, curved beak, and feed largely on reptiles. [1913 Webster]
Note: The sacred ibis of the ancient Egyptians ({Ibis aethiopica}) has the head and neck black, without feathers. The plumage of the body and wings is white, except the tertiaries, which are lengthened and form a dark purple plume. In ancient times this bird was extensively domesticated in Egypt, but it is now seldom seen so far north. The glossy ibis ({Plegadis autumnalis}), which is widely distributed both in the Old World and the New, has the head and neck feathered, except between the eyes and bill; the scarlet ibis (Guara rubra) and the white ibis (Guara alba) inhabit the West Indies and South America, and are rarely found in the United States. The wood ibis (Tantalus loculator) of America belongs to the Stork family (Ciconid[ae]). See Wood ibis. [1913 Webster]