[proh-tee-uh m, -shee-uh m]
- the lightest and most common isotope of hydrogen. Symbol: H1
Origin of protium
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
Examples from the Web for 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.
- the most common isotope of hydrogen, having a mass number of 1
C20: New Latin, from proto- + -ium
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.