1. microscopic, microscopical

usage: of or relating to or used in microscopy; "microscopic analysis"; "microscopical examination"

2. microscopic, microscopical, visible (vs. invisible), seeable

usage: visible under a microscope; using a microscope

3. microscopic, microscopical, small (vs. large), little (vs. big)

usage: so small as to be invisible without a microscope; "differences were microscopic"

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