Pest

·noun A fatal epidemic disease; a pestilence; specif., the plague.

II. Pest ·noun Anything which resembles a pest; one who, or that which, is troublesome, noxious, mischievous, or destructive; a nuisance.

sheep-pest
n. a common Australian weed, Acama ovina, Cunn., N.O. Rosaceae, found in allthe colonies; so called...

Dictionary of Australasian Words Phrases and Usages by Edward E. Morris