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nanoparticle

[nan-oh-pahr-ti-kuh l, ney-noh-]
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noun
  1. a microscopic particle of matter that is measured on the nanoscale, usually one that measures less than 100 nanometers.
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Origin of nanoparticle

First recorded in 1980–85; nano- + particle
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
British Dictionary definitions for nanoparticle

nanoparticle

noun
  1. a particle with dimensions less than 100 nanometres
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Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012