from The American Heritage® Dictionary of the English Language, 4th Edition
- n. The lens positioned farthest from the eye in a compound eyepiece.
from the GNU version of the Collaborative International Dictionary of English
- n. that one of the two lenses forming the eyepiece of an astronomical telescope or compound microscope which is nearer the object glass; -- called also field glass.
from The Century Dictionary and Cyclopedia
- n. Same as field-glass, 3.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. the lens that is farthest from the eye in an optical device with more than one lens
Sorry, no etymologies found.