Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
mulgĕo, si, sum or ctum, 2, v. a. [Sanscr marǵ, wipe or rub away; Gr. ἀ-μέλγω; Germ. melken; Engl. milk], to milk: oves, Verg. E. 3, 5: capras, Plin. 10, 39, 56, § 115.
Absol.: mulgent ad caseum faciendum, Varr. R. R. 2, 11, 4.
Prov.: mulgere hircos, of something impossible, Verg. E. 3, 91.