opisometer

(redirected from Map measurer)
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opisometer

[‚äp·ə′säm·əd·ər]
(engineering)
An instrument for measuring the length of curved lines, such as those on a map; a wheel on the instrument is traced over the line.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.