Etymology
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microdot (n.)

"tiny capsule of LSD," by 1971, from micro- + dot (n.). Earlier it was a term in espionage for an extremely reduced photograph that could be disguised as a period dot on a typewritten manuscript (by 1946).

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Definitions of microdot

microdot (n.)
photograph reduced to the size of a dot (usually for purposes of security);
From wordnet.princeton.edu