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1. Visible under a microscope; using a microscope
   - microscopical
    
2. Extremely precise with great attention to details
   "examined it with microscopic care"
    
3. So small as to be invisible without a microscope
   "differences were microscopic";
   - microscopical
    
4. Of or relating to or used in microscopy
   "microscopic analysis";
   - microscopical

See also: little, precise, seeable, small, visible

Encyclopedia: Microscopic