A variant or related form meaning relating to or characteristic of melancholy or a black-bile temperament.
From Latin atra bilis 'black bile' + -ar adjectival suffix. Similar to atrabilaire with variant ending.
The multiple variant forms (atrabilaire, atrabilar, atrabilarian) show how old medical terms accumulated spelling variations before modern standardization.
Complete word intelligence in one call. Free tier — 50 lookups/day.