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Webster 1913 Edition

Placoid

Plac′oid

,

Adj.

[Gr.

πλάξ

,

πλακός

, a tablet +

-oid

.]

(Zool.)

Platelike; having irregular, platelike, bony scales, often bearing spines; pertaining to the placoids.

Plac′oid

,

Noun.

(Zool.)

(a)

Any fish having placoid scales, as the sharks.

(b)

One of the Placoides.