DictionaryRoot: infestare
Latin
infestare
to attack, disturb
1 / 1

noun
infestation
in-feh-STAY-shun/ˌɪnfeˈsteɪʃn/
The presence of pests in damaging numbers.
Etymology
The underlying verb meant to attack or trouble. Its later sense of swarming over something or attacking parasitically connects that hostile activity with the presence of unwanted pests.