[proh-tee-uh m, -shee-uh m]
the lightest and most common isotope of hydrogen. Symbol: H1
Origin of protium
First recorded in 1930–35; prot-
Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
Examples from the Web for protium
Historical Examples of protium
I was prevented from doing this immediately by difficulties in the Protium Works.
We had supposed you would have been told when you were assigned to the protium research.
That is one reason I am so interested in this protium on which you chemists are working.
Nor did he possess any great knowledge of the protium mines, for he had never visited them.
I was immediately installed in my new office, as Director of the Protium Works.
British Dictionary definitions for protium
the most common isotope of hydrogen, having a mass number of 1
Word Origin for protium
C20: New Latin, from proto- + -ium
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
The most abundant isotope of hydrogen, having an atomic mass of 1. Its nucleus consists of a single proton. See more at hydrogen.
The American Heritage® Science Dictionary
Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.