Etymograph

English

femtokatal

From femto- + katal.

A compound of femto- + katal

Proto-Germanic *fimftehun ‘fifteen’

Old Norse fimmtán ‘fifteen’

Danish femten ‘fifteen’

English femto-

Ancient Greek καταλύω ‘I dissolve’

Ancient Greek κατάλυσις ‘dissolution’

English katal

Today it means

noun An SI unit of catalytic activity equal to 10⁻¹⁵ katals. Symbol: f

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

Etymograph / femtokatal