adj. Located or occurring at the Earth's surface, especially on land
the GNU version of the Collaborative International Dictionary of English
adj. Beneath the sky; in the open air; specifically (Geol.), taking place on the earth's surface, as opposed to subaqueous.
The Century Dictionary and Cyclopedia
In geology, formed, produced, or deposited in the open air, and not beneath the sea, or under water, or below the surface; not submarine or subterranean: thus, subaërial denudation or erosion: See æolian, 2.
Word Usage
"This estimate includes both subaerial and submarine volcanoes, about in equal amounts."