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or gram atom

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noun Chemistry.
  1. the quantity of an element whose weight in grams is numerically equal to the atomic weight of the element.
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Origin of gram-atom

First recorded in 1895–1900
Also called gram-atomic mass, gram-a·tom·ic weight [gram-uh-tom-ik, -tom-] /ˈgræm əˈtɒm ɪk, -ˌtɒm-/.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018