Source : Webster's Revised Unabridged Dictionary (1913)

Carthusian \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.

Carthusian \Car*thu"sian\, a.
   Pertaining to the Carthusian.

Source : WordNet®

Carthusian
     adj : of or relating to the Carthusian order
     n : a member of the Carthusian order