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n. A writing system, similar to a syllabary, in which there is one glyph (that is a symbol or letter) for each consonant or consonantal phoneme. Some languages that use abjads are Arabic, Hebrew, Persian, and Urdu. Abjads differ from syllabaries (such as the Japanese hiragana) in that the vowel quality of each letter is left unspecified, and must be inferred from context and grammar.

"Arabic uses a writing system that we haven't seen yet: an abjad, which is basically an alphabet that doesn't have any vowels-the reader must supply them."

abugida    Abjad numerals