an ancient alphabetical writing system used by the Celts in Britain and Ireland, consisting of straight lines drawn or carved perpendicular to or at an angle to another long straight line
Word origin
C17: from Old Irish ogom, of uncertain origin but associated with the name Ogma, legendary inventor of this alphabet
ogham in American English
(ˈɑgəm; ˈoʊəm)
noun
an alphabetic system for writing Old Irish, developed in the 5th and 6th cent. a.d., in which the letters are represented by various combinations of lines or notches as carved along the edge of a memorial stone