What does "serrated" mean?

Serrated: (Bot.) Beset with teeth pointing forwards or upwards; as, serrate leaves. Doubly serrate, having small serratures upon the large ones, as the leaves of the elm. -- Serrate-ciliate, having fine hairs, like the eyelashes, on the serratures; -- said of a leaf. -- Serrate-dentate, having the serratures toothed.