OGHAM

[ogham] or ogam n [Ir ogham, fr. MIr ogom, ogum] (1729): the alphabetic system of 5th and 6th century Irish in which an alphabet of 20 letters is represented by notches for vowels and lines for consonants and which is known principally from inscriptions cut on the edges of rough standing tombstones -- ogham.ic adj -- ogham.ist n