The Collaborative International Dictionary of English v.0.48:

Multum \Mul"tum\, n.
   An extract of quassia licorice, fraudulently used by brewers
   in order to economize malt and hops. --Craig.
   [1913 Webster]

   Hard multum, a preparation made from Cocculus Indicus,
      etc., used to impart an intoxicating quality to beer.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Cocculus Indicus \Coc"cu*lus In"di*cus\, n. [NL. cocculus (dim.
   of L. coccum kermes berry) + L. Indicus of India.] (Bot.)
   The fruit or berry of the Anamirta Cocculus, a climbing
   plant of the East Indies. It is a poisonous narcotic and
   stimulant.
   [1913 Webster]