Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
Sentīnus, i, m. [sentio], the deity who gives sensation to new-born infants, Varr. in Aug. Civ. Dei, 7, 2 fin.; Tert. ad Nat. 2, 11; cf. Becker, Antiq. 4, p. 10.