"whiskey made in Ireland," especially the strong sort distilled privately and illicitly, 1812, from Irish poitin "little pot" (suggesting distillation in small quantities), from English pot (n.1) "vessel" + diminutive suffix -in, -een.
potation
potato
pot-bellied
pot-belly
potboiler
poteen
Potemkin
potence
potency
potent
potentate