\Ap`pui"\, n. [F., fr. L. ad + podium foothold, Gr. ?,
dim. of ?, ?, foot.]
A support or supporter; a stay; a prop. [Obs.]
      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}. [F., a point of support.] (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.

\Ap`pui"\, n. (Man.)
The mutual bearing or support of the hand of the rider and
the mouth of the horse through the bit and bridle.
{Point d'appui}, any point of support or basis of operations,
   as a rallying point.