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Cycloidei
Cycloidei Cy*cloi"de*i (s?-kloi"d?-?), n. pl. [NL., fr. Gr.
ky`klos circle + -oid.] (Zo["o]l.)
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.
Meaning of Cycloidei from wikipedia