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Webster 1913 Edition

Noun.

(Chem.)

A carbohydrate, isomeric with cane sugar, contained in gum arabic, from which it is extracted as a white, amorphous substance.

Mucilage, especially that made of gum arabic.

arabin ‎(uncountable)

(organic chemistry, dated) A carbohydrate, isomeric with cane sugar, found in gum arabic.
(dated) Mucilage, especially that made of gum arabic.

a carbohydrate found in gum arabic

arabin