from The American Heritage® Dictionary of the English Language, 4th Edition
- n. The plane intersecting an observer's position perpendicular to the line formed by the observer's nadir and zenith.
from the GNU version of the Collaborative International Dictionary of English
- adj. See Horizon, n., 2. (a).
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. the line at which the sky and Earth appear to meet
Sorry, no etymologies found.