(linguistics) A synonymous but not identical, coexisting form (variation) of a word, such as an accepted alternative spelling.

Empetrum; a small genus of dwarf evergreen shrubs that bear edible fruit. / Empetrum nigrum; a species of crowberry. / A fruit of this plant.

Dewormer, medicine used in deworming an animal. / Vermicide, any substance used to kill worms.

(geometry) A configuration of 15 lines and 15 points, having three points on each line and three lines through each point, and containing no triangles.