Back Fin on a Shark

This page is the CodyCross answer for the clue below from Wild West, Group 424, Puzzle 3 (Suspenders).

Question is: Back Fin on a Shark

and the answer is: DORSAL

Word Meaning:

DORSAL — (anatomy, zootomy) With respect to, or concerning the side in which the backbone is located, or the analogous side of an invertebrate.

Definitions from Wiktionary.