LATIN DICTIONARYLexicon Latīnum
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“impregnate” in Latin

The English word impregnate itself goes back to Latin praegnās, through impraegnātus.

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

impregnate
seminare (a field, an animal): gravidare (a person, Aurelius Victor, Epit., 29, 14; figuratively the earth, as Cic., N.D., 2, 23, in., terra gravidata seminibus): implere (an animal): maritare (of animals and trees, post-Augustan).

Quick answer

What is the Latin word for impregnate?
The usual Latin words for “impregnate” are sēminō, gravidō, impleō; also marītō. 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.