submicron

[ suhb-mahy-kron ]
/ sʌbˈmaɪ krɒn /

adjective

(of particles) being less than a micron in overall dimensions.

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Origin of submicron

First recorded in 1945–50; sub- + micron
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020