atto-
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atto-
[′ad·ō] (physics)
A prefix representing 10-18, which is 0.000 000 000 000 000 001, or one-millionth of a millionth of a millionth. Abbreviated a.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
atto-
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