from The American Heritage® Dictionary of the English Language, 4th Edition
- n. The eye unassisted by an optical instrument.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. Eyesight, unaided by equipment such as a telescope or microscope.
from the GNU version of the Collaborative International Dictionary of English
- adj. the eye alone, unaided by eyeglasses, or by telescope, microscope, or other magnifying device.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. 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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