What is "grallae"

Grallae \Gral"l[ae]\, n. pl. [NL., fr. L. grallae stilts, for gradulae, fr. gradus. See Grade.] (Zo["o]l.) An order of birds which formerly included all the waders. By later writers it is usually restricted to the sandpipers, plovers, and allied forms; -- called also Grallatores.