"Echinoid" is a word in ENGLISH

echinoid ENGLISH
Definition:

Of or pertaining to the Echinoidea.

echinoid ENGLISH
Definition:

One of the Echinoidea.

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echinidan ENGLISH

One the Echinoidea.

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echinoidea ENGLISH

The class Echinodermata which includes the sea urchins. They have a calcareous, usually more or less spheroidal or disk-shaped, composed …

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sea urchin ENGLISH

Any one of numerous species of echinoderms of the order Echinoidea.

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