The Collaborative International Dictionary of English v.0.48:

Bebeerine \Be*bee"rine\, or Bebirine \Be*bi"rine\
   (b[-e]*b[=e]"r[i^]n or -r[=e]n), n. (Chem.)
   An alkaloid got from the bark of the bebeeru, or green heart
   of Guiana (Nectandra Rodi[oe]i). It is a tonic,
   antiperiodic, and febrifuge, and is used in medicine as a
   substitute for quinine. [Written also bibirine.]
   [1913 Webster]