Etymograph

English

femtohenry

From femto- + henry.

Formed from femto- + henry

Proto-Germanic *fimftehun ‘fifteen’

Old Norse fimmtán ‘fifteen’

Danish femten ‘fifteen’

English femto-

Today it means

noun One quadrillionth (10⁻¹⁵) of a henry.

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

Etymograph / femtohenry