Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
* sescēnāris, e, adj. [deriv. and signif. unknown]: bovis sescenaris jecur, Liv. 41, 15, 1 (but the conjectural correction to sescennalis or sexennis is improbable) Weissenb. ad loc.