ctenoid

[ tee-noid, ten-oid ]

/ ˈti nɔɪd, ˈtɛn ɔɪd /

comblike or pectinate; rough-edged.

having rough-edged scales.

Origin of ctenoid

First recorded in 1830–40, ctenoid is from the Greek word ktenoeidḗs like a comb. See cteno-, -oid

Louis Agassiz distinguished four kinds of scales—placoid, ganoid, cycloid and ctenoid.

Zoology: The Science of Animal Life |Ernest Ingersoll
In general, prickly points on the skin are modifications of ctenoid scales.

A Guide to the Study of Fishes, Volume 1 (of 2) |David Starr Jordan
The distinctions between cycloid and ctenoid scales, between placoid and ganoid fishes, are vague, and can hardly be maintained.

Encyclopaedia Britannica, 11th Edition, Volume 14, Slice 3 |Various
Ctenoid scales have a comb-edge of fine prickles or cilia; cycloid scales have the edges smooth.

A Guide to the Study of Fishes, Volume 1 (of 2) |David Starr Jordan

There are two principal types of Teleostean scales, the cycloid and ctenoid.

The Vertebrate Skeleton |Sidney H. Reynolds

ctenoid

/ (ˈtiːnɔɪd, ˈtɛn-) /

biology toothed like a comb, as the scales of perches

C19: from Greek ktenoeidēs, from kteis comb + -oeidēs -oid