Cy*cloi"de*i (s?-kloi"d?-?), n. pl. [NL., fr. Gr. circle + -oid.] Zool.
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.