adj.1 (of a family, class, or species) that has died out.
2 a (of fire etc.) no longer burning. b (of a volcano) that no longer erupts.
3 (of life, hope, etc.) terminated, quenched.
4 (of an office etc.) obsolete.
5 (of a title of nobility) having no qualified claimant.
Etymology: ME f. L exstinguere exstinct- (as EX-(1), stinguere quench)