from The American Heritage® Dictionary of the English Language, 4th Edition
- n. A chart of letters and figures of various sizes, used to test visual acuity.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. a sign or poster showing letters or symbols in progressively smaller lines of type, used to test distance vision
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. a chart that is read from a fixed distance; used as a test of vision
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