from The Century Dictionary.
- noun In a telescope or microscope, the lens which first receives the rays of light coming directly from the object, and collects them into a focus, where they form an image which is viewed through the eyepiece.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- noun the lens or system of lenses in a telescope or microscope that is nearest the object being viewed
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