STEROIDHO, yak sinfi payvasthoi orgavikiro guyand, ki ba lzoprenoidho mansuband. Dar tabiati zinda (mikroorganizmho, rastaniho va hayvonot) khelhoi gunoguni Stereoidho mavjudand. Ba Stereoidho steriyaho, kislotahoi talkha, vitamiihoi guruhi D, gormonhon jinsi va gadudhoi boloi gurda mansuband.
Stereoidho dar tib, neterinariya va chorvodori ba kor meravand.