APPUI n.
of any great height, there would be stays and appuies set to it. Holland. Point d'appui. Etym: [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.…
AQUA n.
called aqua ammonia. -- Aqua marine, or Aqua marina. Same as Aquamarine. -- Aqua regia. Etym: [L., royal water] (Chem.), a very corrosive fuming yellow liquid consisting of nitric and hydrochloric acids. It has the power of dissolving gold, the "royal" metal. -- Aqua Tofana, a fluid containing arsenic, and used for…