(history) A former country in East Africa, a communist government that existed in Ethiopia from 1987 to 1991.

The cardinal number occurring after eighteen and before twenty, represented in Roman numerals as XIX and in Arabic numerals as 19. It is the last/largest of the teens.

(science fiction) An inhabitant of Charon (a moon of Pluto).

(biochemistry) Reducing the production or effects of thyroid hormones.