\Glu"co*side\, n. [See {Glucose}.] (Chem.)
One of a large series of amorphous or crystalline substances,
occurring very widely distributed in plants, rarely in
animals, and regarded as influental agents in the formation
and disposition of the sugars. They are frequently of a
bitter taste, but, by the action of ferments, or of dilute
acids and alkalies, always break down into some
characteristic substance (acid, aldehyde, alcohol, phenole,
or alkaloid) and glucose (or some other sugar); hence the
name. They are of the nature of complex and compound ethers,
and ethereal salts of the sugar carbohydrates.