Pronunciation: (âr'tu-sûr'fus), [key]
operating or directed from a flying aircraft to the surface: air-to-surface missiles.
from a flying aircraft to the surface of the earth: They released the rockets air-to-surface. Also called air-to-ground Pronunciation: (âr'tu-ground'). [key]
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.