‖Ap′pui″ (�), n. [F., fr. L. ad + podium foothold, Gr. �, dim. of �, �, foot.] A support or supporter; a stay; a prop.
If a vine be to climb trees that are of any great height, there would be stays and appuies set to it.
Holland.
Point d'appui (�). (Mil.) (a) A given point or body, upon which troops are formed, or by which are marched in line or column. (b) An advantageous defensive support, as a castle, morass, wood, declivity, etc.