[ fin-lit ]
/ ˈfɪn lɪt /
a small, detached ray of a fin in certain fishes, as mackerels.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
Examples from the Web for finlet
Each of the peculiar dorsal spines is primitively a single spine, not a finlet of several pieces, as some have suggested.A Guide to the Study of Fishes, Volume 1 (of 2)|David Starr Jordan