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placoid
[ plak-oid ]
adjective
- platelike, as the scales or dermal investments of sharks.
placoid
/ ˈplækɔɪd /
adjective
- platelike or flattened
- (of the scales of sharks and other elasmobranchs) toothlike; composed of dentine with an enamel tip and basal pulp cavity
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Word History and Origins
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Word History and Origins
Origin of placoid1
C19: from Greek plac-, plax flat
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Example Sentences
The tail is asymmetrical (heterocercal), and numerous placoid scales (dermal denticles) are embedded in the skin.
From Project Gutenberg
They pass by quite insensible gradations into normal placoid scales, such as cover the general surface of the body.
From Project Gutenberg
In some cases the placoid scales are enlarged to form plates or spines capped or coated with enamel.
From Project Gutenberg
The Thornback Skate is covered with prickles (placoid scales).
From Project Gutenberg
The teeth of Selachii are fundamentally identical with placoid scales.
From Project Gutenberg
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