gram-atomic weight

noun

gram-atom·​ic weight ˈgram-ə-ˈtä-mik- How to pronounce gram-atomic weight (audio)
: the mass of one mole of an element equal in grams to the atomic weight

called also gram-atom

Word History

First Known Use

1927, in the meaning defined above

Time Traveler
The first known use of gram-atomic weight was in 1927

Browse Nearby Words

Cite this Entry

“Gram-atomic weight.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/gram-atomic%20weight. Accessed 3 Feb. 2026.

Medical Definition

gram-atomic weight

noun
gram-atom·​ic weight
variants also British gramme-atomic weight
: the mass of one mole of a chemical element equal in grams to the element's atomic weight
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