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From The Collaborative International Dictionary of English v.0.48:
Wader \Wad"er\, n. 1. One who, or that which, wades. [1913 Webster] 2. (Zool.) Any long-legged bird that wades in the water in search of food, especially any species of limicoline or grallatorial birds; -- called also wading bird. See Illust. g, under Aves. [1913 Webster]