drug abuse of more than one kind of drug

(pathology) A growth in the nose commonly connected with allergic rhinitis, but not directly caused by it, arising mainly from the mucous membranes and paranasal sinuses.

plural of polyester Protestant

(Ireland, informal, derogatory) A newcomer in the Church of Ireland; an Irish Anglican by conviction.

plural of polyvinyl chloride

Alternative spelling of polyvinyl chloride

(mathematics, representation theory) A member P_(y,w)(q) of a certain family of integral polynomials that are indexed by pairs of elements y, w of a Coxeter group W, which can in particular be the Weyl group of a Lie group.

Rattus exulans, the third most numerous species of rat on Earth.

In Freudian psychoanalysis, the ability to gain sexual gratification outside socially normative sexual behaviours.

plural of Polynesian rat