Sun"stroke` (?), n. (Med.) Any affection produced by the action of the sun on some part of the body; especially, a sudden prostration of the physical powers, with symptoms resembling those of apoplexy, occasioned by exposure to excessive heat, and often terminating fatally; coup de soleil.

Sun"stroke` (?), n. (Med.) Any affection produced by the action of the sun on some part of the body; especially, a sudden prostration of the physical powers, with symptoms resembling those of apoplexy, occasioned by exposure to excessive heat, and often terminating fatally; coup de soleil.

• (pathology) Heatstroke caused by an excessive exposure to the sun's rays.