Acronym of Organization of Petroleum Exporting Countries.

(organic chemistry) The bicyclic heterocycle, 5,6,7,8-tetrahydro-[1,3,4]thiadiazolo[3,4-a]pyridazin-3-one that has antimicrobial activity

An open space in an otherwise solid object through which a person can step or walk.

A Muisca tribal chief who covered himself in gold dust. / A legendary lost city of gold. / (by extension) Any place of fabulous wealth. / A city, the county seat of Union County, Arkansas, United S...