Perischoechinoida

plural noun Pe·ris·cho·ech·i·noi·da \ pə¦ris(ˌ)kōˌekəˈnȯidə \

Definition of Perischoechinoida

: a large order of regular Paleozoic Echinoidea

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Origin and Etymology of perischoechinoida

New Latin perischo- (from Greek perischesis surrounding, from periechein, perischein to surround—from peri- + echein, schein to have, hold—+ -sis) + echin- + -oida