The Collaborative International Dictionary of English v.0.48:

Bilious \Bil"ious\ (b[i^]l"y[u^]s), a. [L. biliosus, fr. bilis
   bile.]
   1. Of or pertaining to the bile.
      [1913 Webster]

   2. Disordered in respect to the bile; troubled with an excess
      of bile; as, a bilious patient; dependent on, or
      characterized by, an excess of bile; as, bilious symptoms.
      [1913 Webster]

   3. Choleric; passionate; ill tempered. "A bilious old nabob."
      --Macaulay.
      [1913 Webster]

   Bilious temperament. See Temperament.
      [1913 Webster]

WordNet (r) 3.0 (2006):

bilious
    adj 1: relating to or containing bile [syn: bilious,
           biliary]
    2: suffering from or suggesting a liver disorder or gastric
       distress [syn: bilious, liverish, livery]
    3: irritable as if suffering from indigestion [syn:
       atrabilious, bilious, dyspeptic, liverish]