Microdotting

microdot

[mahy-kruh-dot]
noun
1.
a photograph reduced to the size of a printed period, used especially to transmit messages, photographs, drawings, etc.
verb (used with object), microdotted, microdotting.
2.
to make a microdot of.

Origin:
1945–50; micro- + dot1

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
microdot (ˈmaɪkrəʊˌdɒt)
 
n
1.  a microcopy about the size of a pinhead, used esp in espionage
2.  a tiny tablet containing LSD

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