1. Relating to bile, a dark green to yellowish brown fluid produced by the liver of most vertebrates, that aids the digestion of lipids in the small intestine: A bilious condition refers to suffering from liver dysfunction; especially, an excessive secretion of gall.

The term bilious also indicates a peevish or an ill-natured disposition.

The word bilious goes back to the old belief that there were four bodily humors, black bile, yellow bile, phlegm, and blood, and these four humors determined a person's temperament.

Bilious was the personality type associated with an excess of yellow bile.
2. Etymology: bilious derives from the French bilieux, which in turn came from bilis, the Latin term for "bile".

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