Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
centĭmănus, ūs (cf. Prisc. p 718 P.; Lachm. ad Lucr. 2, p. 107), adj. [centum-manus], having a hundred hands, an epithet of Gyges, Hor. C. 2, 17, 14; of Typhoeus, Ov. M. 3, 303: infantes centimanos, Arn. 2, p. 97, acc. to Lachm. l. l. (al. centenarios).