Main Entry: pro·bi·ot·ic

Pronunciation: \prō-bī-ˈä-tik, -bē-ˈä-\

Function: noun

Etymology: ²pro- + -biotic (as in antibiotic)

Date: 1951

: a preparation (as a dietary supplement) containing live bacteria (as lactobacilli) that is taken orally to restore beneficial bacteria to the body; also : a bacterium of such a preparation

— probiotic adjective