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Affixes: the building blocks of English
Affixes: the building blocks of English
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placo-

A plate.

[Greek plax, plak-, flat plate.]

A placode in an embryo is a thickening of the ectoderm that will later develop into specialized sensory organs; a fish scale that is placoid is shaped like a plate; a placoderm (Greek derma, skin) is a fossil fish of the Devonian period, which has the front part of its body encased in broad flat bony plates; a placodont (Greek odous, odont-, tooth) is a fossil reptile of the Triassic period, which has short flat grinding palatal teeth.

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