The Collaborative International Dictionary of English v.0.48:

Quinoidine \Qui*noid"ine\, n. [Quinine + -oid.] (Med. Chem.)
   A brownish resinous substance obtained as a by-product in the
   treatment of cinchona bark. It consists of a mixture of
   several alkaloids. [Written also chinoidine.]
   [1913 Webster]