Medical Definition of Paleechinoidea
1.
An extinct order of sea urchins found in the Paleozoic rocks. They had more than twenty vertical rows of plates.
Synonym: Palaeechini.
Alternative forms: Palaeechinoidea.
Origin: NL. See Paleo-, and Echinoidea.
Source: Websters Dictionary
(01 Mar 1998)
Lexicographical Neighbors of Paleechinoidea
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