(1):

(n.) An aromatic plant of the genus Melissa.

(2):

(n.) The resinous and aromatic exudation of certain trees or shrubs.

(3):

(n.) Any fragrant ointment.

(4):

(n.) Anything that heals or that mitigates pain.

(5):

(v. i.) To anoint with balm, or with anything medicinal. Hence: To soothe; to mitigate.