Definition of mountain balm in US English:

mountain balm

noun

US
  • 1A medicinal herb of the genus Eriodictyon (family Hydrophyllaceae), especially E. californicum.

  • 2A white-flowering shrub, Ceanothus velutinus (family Rhamnaceae), of the western U.S., the leaves of which are used as a tobacco substitute by some North American Indians.

Origin

Early 19th century (in an earlier sense). From mountain + balm.

Pronunciation

mountain balm

/ˌmaʊntɪn ˈbɑːm/