"microscopical" in the adjective sense
1. microscopic, microscopical
of or relating to or used in microscopy
"microscopic analysis"
"microscopical examination"
2. microscopic, microscopical
visible under a microscope using a microscope
3. microscopic, microscopical
so small as to be invisible without a microscope
"differences were microscopic"
Source: WordNet® (An amazing lexical database of English)
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