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The Collaborative International Dictionary
Eucalyn

Eucalyn \Eu"ca*lyn\ ([=u]"k[.a]*l[i^]n), n. (Chem.) An unfermentable sugar, obtained as an uncrystallizable sirup by the decomposition of melitose; also obtained from a Tasmanian eucalyptus, -- whence its name.

Wiktionary
eucalyn

n. (context organic compound English) An unfermentable sugar obtained from eucalyptus or by the decomposition of melitose.