Any of several plants of the genus Dryas; the mountain avens. / One of two periods of cold and increased glaciation thousands of years before the present (Younger Dryas and Older Dryas).

A keen-edged knife of peculiar shape, used in shaving the hair from the face or other parts of the body. / Any tool or instrument designed for shaving. / The sharp tusk of a wild boar.

(rail transport, Britain) Initialism of London, Brighton and South Coast Railway.

(science fiction) A disturbance in the flow of time.