Strut, n. [For senses 2 & 3 cf. LG. strutt rigid.] 1. The act of strutting; a pompous step or walk.
2. (Arch.) 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.
3. (Engin.) 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.