The Collaborative International Dictionary of English v.0.48:

Melezitose \Me*lez"i*tose`\, n. [F. m['e]l[`e]ze the larch +
   melitose.] (Chem.)
   A variety of sugar, isomeric with sucrose, extracted from the
   manna of the larch (Larix). [Written also melicitose.]
   [1913 Webster]