femto- root words — words with the femto- root

The root femto- comes from Danish femten, meaning fifteen (10^-15). 1 words in Dendril are built from it, including femtosecond. Dendril shows them on a free interactive word map — no signup, no ads.

Words that use the femto- root

Explore words with femto- — words containing the femto- root and sharing its sense of "fifteen (10^-15)". Examples include femtosecond. Click any word to see its own roots, definition, and related words.

What does femto- mean?

The femto- root means fifteen (10^-15), from Danish femten. Recognizing it helps you decode and remember the many English words built on this root.