LATIN DICTIONARYLexicon Latīnum
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“cement” in Latin

The English word cement itself goes back to Latin caedō, through caementum.

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

cement s.
*caementum (as a technical term, PROP., chip of stone; particles of hewn stone mixed into mortar, mortario caementum addatur, Vitr.): maltha (a kind of cement, of hog’s fat and lime, for water-pipes, etc.): ferrumen (iron solder or cement): glutinum: gluten (glue): *lithocolla (but this in Plin. is a false reading) [arenatum sc. opus was a mortar; one part of lime to two of sand, Vitr.].
FIG., = bond, ligamentum: vinculum.
cement
v, malthare: ferruminare (e.g., bitumine: plumbo): lithocolla colligare aliquid [SYN. in CEMENT, s.] : glutinare: conglutinare (to glue).
FIG., conglutinare aliquid (e.g., concordiam ordinum): firmare: confirmare: a peace, pacem (quasi) coagmentare.

Quick answer

What is the Latin word for cement?
The usual Latin words for “cement” are caementum, maltha, ferrūmen; also glūten, ligāmentum, vinculum. 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.