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derm

[durm] /dɜrm/
noun
1.
a navigational device for making a nearby object conspicuous on a radarscope.
Origin
d(elayed) e(cho) r(adar) m(arker)
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Word Origin and History for derms

derm

n.

1835, from Greek derma "skin, hide, leather" (see derma).

Online Etymology Dictionary, © 2010 Douglas Harper
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