/buyl/ , n.
1. Physiol. a bitter, alkaline, yellow or greenish liquid, secreted by the liver, that aids in absorption and digestion, esp. of fats.
2. ill temper; peevishness.
3. Old Physiol. either of two humors associated with anger and gloominess. Cf. black bile, yellow bile .
[ 1655-65; bilis ]