WordReference Random House Unabridged Dictionary of American English © 2025
thorn•back
(thôrn′bak′),USA pronunciation n.
- Fisha skate, Raja clavata, of European waters, having short spines on the back and tail.
- Fisha California ray, Platyrhinoidis triseriatus, belonging to the guitarfish group.
- 1250–1300; Middle English; see thorn, back1