Lewis Short
(verb) : impinguo (inp-), no
* Perf., ātum, 1, and n. in-pinguis.
* Act., to make fat (post-class.): impinguo πιαίνω, Gloss. Philox.: cui cor impinguatum,Tert. Jejun. 6.—*
* Neutr., to become fat: porcellum tamdiu coques, donec lenis fiat et impinguet,Apic. 8, 7, § 375.
Charlton T. Lewis, Charles Short, A Latin Dictionary