Cycloidei \Cy*cloi"de*i\ (s?-kloi"d?-?), n. pl. [NL., fr. Gr.
ky`klos 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.
[1913 Webster]