LATIN DICTIONARYLexicon Latīnum
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“grease” in Latin

The English word grease itself goes back to Latin crassus, through *crassia.

Riddle & Arnold A Copious and Critical English–Latin Lexicon, 1864

grease s.
unguen (general term): pingue (oily fat): arvina (= “durum pingue inter cutem et viscus,” Serv., used for brightening shields, etc., Verg., Aen., 7, 627): axungia (for a carriage, waggon, etc., post-Augustan). Vid: FAT.
grease v.
linere: oblinere: perlinere: illinere aliquid aliqua re: ungere: perungere aliquid aliqua re (to rub with anything fat): illinere aliquid alicui rei (to rub into).

Quick answer

What is the Latin word for grease?
The usual Latin words for “grease” are unguen, pinguis, arvīna; also axungia, linō, oblinō. The right choice depends on the sense; see the distinctions below.

Entry from J. E. Riddle & T. K. Arnold, A Copious and Critical English–Latin Lexicon (rev. C. Anthon, New York: Harper, 1864), digitised by Fergus J. P. Walsh, CC BY-SA 4.0; Latin markup adapted by latindictionary.co.