Longman Dictionary of Contemporary English homepage

Date: 1800-1900
Language: Modern Latin
Origin: Greek, from mikros 'small'

micrometre

 noun
     
mi‧crom‧e‧tre British English ; micrometer American English also mi‧cron [countable]
a unit for measuring length. There are one million micrometres in one metre.
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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