Longman Dictionary of Contemporary English homepage

microscopic

 adjective
     
Related topics: Biology, Technology
mi‧cro‧scop‧ic
1 extremely small and therefore very difficult to see:
a microscopic speck of dust
Inspectors discovered microscopic cracks in the hull of the submarine.
2 [only before noun]HBT using a microscope:
The cells were identified through microscopic analysis.
—microscopically adverb:
The seeds are microscopically small.
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.
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