# femtomolar

> English word · Adjective

## Definitions
1. Having a concentration of 10⁻¹⁵ moles per litre

## Etymology
From femto- + molar.

## Source
Compiled from Wiktionary via kaikki.org (CC BY-SA). Data vintage: 2026-05-06.
Canonical page: https://plainspell.com/en/word/femtomolar