Pronunciation: (og'um, ô'gum),[key] —n. 1. an alphabetical script used originally for inscriptions in an archaic form of Irish, from about the 5th to the 10th centuries.
2. any of the 20 characters of this script, each consisting of one or more strokes for consonants and of notches for vowels cut across or upon a central line on a stone or piece of wood.
3. an inscription employing this script. Also,ogam.