adjective Chemistry.

having two atoms in the molecule.
containing two replaceable atoms or groups; binary.

Origin of diatomic

First recorded in 1865–70; di-1 + atomic
Related formsdi·at·o·mic·i·ty [dahy-at-uh-mis-i-tee] /ˌdaɪ æt əˈmɪs ɪ ti/, noun
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Examples from the Web for diatomic

Historical Examples of diatomic

British Dictionary definitions for diatomic



((of a compound or molecule))
  1. containing two atoms
  2. containing two characteristic groups or atomsethylene glycol is a diatomic alcohol
Derived Formsdiatomicity (ˌdaɪætəˈmɪsɪtɪ), noun
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

diatomic in Medicine




Made up of two atoms.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.