| Definition - (Aka consonantary |consonantal alphabet)
A type of writing system where there are graphemes for consonants but not for vowels. However, vowels may be shown by marks on the graphemes, e.g. written Hebrew and Arabic are abjads.
The Aleppo Codex: a 10th century Hebrew Bible
1. This is in contrast to alphabets where there are graphemes for both consonants and vowels.
Etymology - The term is an acronym coined by Peter T. Daniels from what were once the first four consonants of the Arabic alphabet.