Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
vesco, ĕre, v. a. [vescor], to feed with any thing: quis nos vescet carne, Tert. Jejun. 5.
Pass., Isid. Orig. 20, 2, 27: vescendi pupilli causā, Dig. 42, 5, 33.