from The American Heritage® Dictionary of the English Language, 4th Edition
- adj. Varying slightly from sphericity and having only slight aberration, as a lens.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- adj. aspherical
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- adj. varying slightly from a perfectly spherical shape
a- + spheric (Wiktionary)