Cy*cloid"al(-al), a. Pertaining to, or resembling, a cycloid; as, the cycloidal space is the space contained between a cycloid and its base.
Cycloidal engine. See Geometric lathe.
Cy*cloi"de*i(s?-kloi"d?-?), n. pl. [NL., fr. Gr. ky`klos circle + -oid.] (Zol.) 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.
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