cycloidei Meaning, Definition & Usage

Cy*cloi"de*i noun plural
Etymology
NL., fr. Gr. circle + -oid.
Definitions
  1. (Zoöl.) An order of fishes, formerly proposed by Agassiz, for those with thin, smooth scales, destitute of marginal spines, as the herring and salmon. The group is now regarded as artificial.

Webster 1913