GNU Collaborative International Dictionary of English

Found one definition

1.       
   Wader (?), 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]