a. Zool. [ad. Gr. κτενοειδής comb-shaped: see -OID.]

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  1.  Resembling a comb; having marginal projections like the teeth of a comb; pectinate; applied to the scales and teeth of certain fishes.

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1872.  H. A. Nicholson, Palæont., 307. Ctenoid scales … consisting of thin horny plates, but having their posterior margins fringed with spines, or cut into comb-like projections.

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  2.  Belonging to the Ctenoidei, an order of fishes in Agassiz’s classification, containing those with ctenoid scales. Also as sb. A ctenoid fish. (Now disused.)

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1847.  Ansted, Anc. World, x. 246. Two orders of Fishes … the Ctenoids and Cycloids.

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1851.  Richardson, Geol., viii. 285. Four fifths of the fishes now living belong to the cycloid and ctenoid orders.

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  Hence Ctenoidean a. and sb. = CTENOID 2.

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1837.  W. Buckland, Geol., I. 270. The Ctenoïdians have their scales jagged or pectinated, like the teeth of a comb.

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