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The Collaborative International Dictionary
Quadriliteral

Quadriliteral \Quad`ri*lit"er*al\, a. [Quadri- + literal.] Consisting of four letters.

Douglas Harper's Etymology Dictionary
quadriliteral

"consisting of four letters," 1771, from quadri- + literal.

Wiktionary
quadriliteral

a. Used to describe word roots in Semitic languages which consist of four letters n. A word root in a Semitic language which consists of four letters