Webster’s Revised Unabridged Dictionary · 1913
Cycloidei
Cy·cloi′de·i (s?-kloi′d?-?), n. pl. [NL., fr. Gr. κύκλος circle + -oid.] (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.