from The American Heritage® Dictionary of the English Language, 5th Edition.
- noun The eye unassisted by an optical instrument.
from Wiktionary, Creative Commons Attribution/Share-Alike License.
Eyesight, unaided by equipment such as a telescopeor microscope.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- noun the eye unaided by any optical instrument that alters the power of vision or alters the apparent size or distance of objects
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