noun ·Rare ·Advanced level

Definitions

Noun

1. 1
   Any of the †Cystidea, a class of extinct echinoderms, now known as the †Cystoidea. obsolete
2. 2
   A stage in the development of many crinoids after the free-swimming larva attaches to a surface, but before it develops the structures necessary to feed.

Etymology

†Cystidea + -an

Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.