\A*["e]"ri*al\, a. [L. a["e]rius. See {Air}.]
1. Of or pertaining to the air, or atmosphere; inhabiting or
   frequenting the air; produced by or found in the air;
   performed in the air; as, a["e]rial regions or currents.
   ``A["e]rial spirits.'' --Milton. ``A["e]rial voyages.''
   --Darwin.
2. Consisting of air; resembling, or partaking of the nature
   of air. Hence: Unsubstantial; unreal.
3. Rising aloft in air; high; lofty; as, a["e]rial spires.
4. Growing, forming, or existing in the air, as opposed to
   growing or existing in earth or water, or underground; as,
   a["e]rial rootlets, a["e]rial plants. --Gray.
5. Light as air; ethereal.
{A["e]rial acid}, carbonic acid. [Obs.] --Ure.
{A["e]rial perspective}. See {Perspective}.