microscopic
adjectiveUK /ˌmaɪ.krəˈskɒp.ɪk/
US /ˌmaɪ.krəˈskɑː.pɪk/
So tiny that you need a special tool to see it.
The dust on the slide was microscopic, so we looked at it through a microscope.
RELATED WORDS
OTHER MEANINGS
2. Very small in size or amount.
The company reported only a microscopic increase in sales.
3. Relating to a microscope or to things seen with one.
The scientist prepared a microscopic slide for the class.
4. Extremely detailed or precise.
She gave the report a microscopic examination before signing it.