LATIN DICTIONARYLexicon Latīnum
suffix · neutersecond declension

-trum

-trum n (genitive -trī)
Classical[trũː]Ecclesiastical[trum]

Meaning

  1. morphemeneutersuffix forming instrument nouns from verbs

Origins

In inherited words, from Proto-Italic *-trom, from Proto-Indo-European *-trom. In words borrowed from Greek (and possibly in some neologisms), from Ancient Greek -τρον (-tron, instrument noun suffix), a cognate of the Latin ending. Compare -culum, -crum, -bulum, -brum; these and -trum seem to have originated as contextual variants of a single suffix.

Quick answers

What does -trum mean in Latin?
-trum, a suffix, means “suffix forming instrument nouns from verbs”.
How do you pronounce -trum?
In classical Latin, [trũː]; in ecclesiastical (church) Latin, [trum].