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