- too small to be seen through a microscope.
Origin of submicroscopic
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
Examples from the Web for submicroscopic
In any case, a microscope would have done Brown little good in trying to detect the submicroscopic beings of the Rell.The Hitch Hikers
Vernon L. McCain
These colloid substances have a submicroscopic or micellian structure; they are web-like, porous and absorb water eagerly.The Natural History of Clay
Alfred B. Searle
Very few, if any, higher life forms existed that did not have some sort of submicroscopic parasite afflicting them.Star Surgeon
- too small to be seen through an optical microscope
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
- Too small to be visible under the most powerful optical microscope.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.