花生酸，是具有20个碳的直链饱和脂肪酸。它是花生油的组成部分（1.1％-1.7％）和玉米油部分（3％）。它的名字源于拉丁文的花生。

花生酸用于生产洗涤剂，感光材料和润滑剂。

不饱和脂肪酸

Arachidic acid, also known as eicosanoic acid, is a saturated fatty acid with a 20-carbon chain. It is as a minor constituent of cupuaçu butter (7%), peanut oil (1.1%–1.7%), corn oil (3%), and cocoa butter (1%).

Typical Fatty acid composition (%): Its name derives from the Latin arachis — peanut. It can be formed by the hydrogenation of arachidonic acid.