In general, any piece of a frame which resists thrust or pressure in the direction of its own length. See Brace, and Illust. of Frame, and Roof.
Any part of a machine or structure, of which the principal function is to hold things apart; a brace subjected to compressive stress; -- the opposite of stay, and tie.
The main support member in a MacPherson suspension system. The strut also serves as the shock absorber.