STROKE n. 22 definitions
the piston plunger, piston rod, crosshead, etc., as of a steam engine or a pump, in which these parts have a reciprocating motion; as, the forward stroke of a piston; also, the entire distance passed through, as by a piston, in such a movement; as, the piston is at half stroke.
SUBSTANCE n. 6 definitions
from any accident; that which constitutes anything what it is; real or existing essence. These cooks, how they stamp, and strain, and grind, And turn substance into accident! Chaucer. Heroic virtue did his actions guide, And he the substance, not the appearance, chose. Dryden.
SUBVERT v. 3 definitions
To overturn from the foundation; to overthrow; to ruin utterly. These are his substance, sinews, arms, and strength, With which he yoketh your rebellious necks, Razeth your cities, and subverts your towns. Shak. This would subvert the principles of all knowledge. Locke.