Ĕm’bo-lŭs, n.

n.; pl. EM’BO-LĬ. [Lat. embolus, Gr. ἔμβολος, running to a point, and so put or thrust in, from ἐμβάλλειν, to throw, thrust, or put in. See EMBLEM.] Something inserted or acting in another; that which thrusts or drives, as a piston or a wedge.