English
infester
From infest + -er.
Formed from infest + -er
Proto-Indo-European *gʷʰen- ‘to strike, slay, kill’
Latin īnfestus ‘hostile’
Latin īnfestō ‘assail, molest’
Old French infester ‘to infest’
Middle English infesten
English infest
Today it means
noun something that infests.
Language periods are conventional ranges, not dates for this word.
Etymograph / infester