Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
lēvir, ĭri, m. [for dēvir, kindred with Sanscr. dēvar, whence juvān = juvenis; Gr. δαήρ], a husband’s brother, brother-inlaw: viri frater levir est: apud Graecos δαὴρ appellatur, Dig. 38, 10, 4, § 6: levir dicitur frater mariti, quasi laevus vir, Non. 557, 8: levir est uxori meae frater meus (i. e. my brother is levir to my wife), Paul. ex Fest. p. 115 Müll. N. cr.