Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
mĕdullo, 1, v. a. [medulla], to fill with marrow (post-class.): cura nimia medullatos artus magni facit, App. Dogm. Plat. 2, 16, p. 21, 13: quando ossa incipiunt medullari, Aug. Anim. 4, 5; Ven. Carm. 3, 7 fin.