Source : Webster's Revised Unabridged Dictionary (1913)

Atrabilarian \At`ra*bi*la"ri*an\, Atrabilarious
\At`ra*bi*la"ri*ous\, a. [LL. atrabilarius, fr. L. atra bilis
   black bile: cf. F. atrabilaire, fr. atrabile.]
   Affected with melancholy; atrabilious. --Arbuthnot.