Horner \Horn"er\, n. 1. One who works or deal in horn or horns. [R.] --Grew. [1913 Webster] 2. One who winds or blows the horn. [Obs.] --Sherwood. [1913 Webster] 3. One who horns or cuckolds. [Obs.] --Massinger. [1913 Webster] 4. (Zool.) The British sand lance or sand eel ({Ammodytes lanceolatus}). [1913 Webster]