gram-atom

noun, Chemistry
1.
the quantity of an element whose weight in grams is numerically equal to the atomic weight of the element.
Also, gram atom.
Also called gram-atomic mass, gram-atomic weight
[gram-uh-tom-ik, -tom-] /ˈgræm əˈtɒm ɪk, -ˌtɒm-/ (Show IPA)
.
Origin
1895-1900