__ Fin; Triangular Fin on a Shark's Back
This page is the CodyCross answer for the clue below from Concert Hall, Group 589, Puzzle 2 (Acoustic Design).
Question is: __ Fin; Triangular Fin on a Shark's Back
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.