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单词 micra
释义

WordReference Random House Unabridged Dictionary of American English © 2024
mi•cra  (mī′krə),USA pronunciation n. 
  1. Physicsa pl. of micron. 

WordReference Random House Learner's Dictionary of American English © 2024
mi•cron /ˈmaɪkrɑn/USA pronunciation   n. [countable], pl. -crons, -cra /-krə/.USA pronunciation  
  1. Weights and Measuresthe millionth part of a meter.

WordReference Random House Unabridged Dictionary of American English © 2024
mi•cron  (mī′kron),USA pronunciation n., pl. -crons, -cra (-krə).USA pronunciation 
  1. Weights and MeasuresAlso called micrometer. the millionth part of a meter. Symbol: μ, mu
  2. Chemistry[Physical Chem.]a colloidal particle whose diameter is between 0.2 and 10 microns.
  3. [Physics.]a very small unit of pressure, equal to that exerted by a column of mercury 1μ high.
Also, mikron. 
  • Greek mīkrón a little, noun, nominal use of neuter singular of mīkrós small; see -on1
  • 1880–85

Collins Concise English Dictionary © HarperCollins Publishers::
micron /ˈmaɪkrɒn/ n ( pl -crons, -cra / -krə/)
  1. a unit of length equal to 10–6 metre. It is being replaced by the micrometre, the equivalent SI unit
Etymology: 19th Century: New Latin, from Greek mikros small
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更新时间：2024/11/11 5:45:59