\Car*thu"sian\, n. [LL. Cartusianus, Cartusiensis, from the town of Chartreuse, in France.] (Eccl. Hist.) A member of an exceeding austere religious order, founded at Chartreuse in France by St. Bruno, in the year 1086.
\Car*thu"sian\, a. Pertaining to the Carthusian.