lionn, m. (gs. leanna, pl. ~ta). 1. (a)A.Med: humour (of the body). ~ fuar, phlegm. ~ rua, choler. ~ dubh, melancholy. ~ dubh, ~ta dubha, a dhéanamh, to become depressed, to sorrow. Chuirfeadh sé ~ dubh ort, it would put you in the dumps. (b)~ fionn, lymph. ~ geal, ichor. ~ gloiní, ~ súl, vitreous humour. ~ uiscí, aqueous humour. 2 = leann.