almond oil, a viscous fluid expressed from the kernels of the fruit of almond trees. The sweet almond tree, Prunus amygdalus, which is native to the Mediterranean region, produces an oil that is used as a demulcent and a mild laxative. Bitter almond oil comes from a different tree (Prunus amygdalus var. amara) and contains toxic chemicals. Despite the risk, bitter almond oil is sometimes used to treat spasms and pain.