Eucalyn :: Eucalyn (n.) An unfermentable sugar, obtained as an uncrystallizable sirup by the decomposition of melitose; also obtained from a Tasmanian eucalyptus, -- whence its name..
Eucalyptol :: Eucalyptol (n.) A volatile, terpenelike oil extracted from the eucalyptus, and consisting largely of cymene..
Eucalyptus :: Eucalyptus (n.) A myrtaceous genus of trees, mostly Australian. Many of them grow to an immense height, one or two species exceeding the height even of the California Sequoia..