English

femtogram

From femto- + gram.

A compound of femto- + gram

Proto-Germanic *fimftehun ‘fifteen’

Old Norse fimmtán ‘fifteen’

Danish femten ‘fifteen’

Ancient Greek γράμμα ‘a small weight, a scruple’

French gramme

English gram

Today it means

noun An SI unit of mass equal to 10⁻¹⁵ grams. Symbol: fg

Language periods are conventional ranges, not dates for this word.

Etymograph / femtogram