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Categories: Terms

European perennial herb (Alkanna tinctoria) having cymes of blue flowers

and red roots. The red dye extracted from the root. Plants of the

Eurasian genus Anchusa, having blue or violet flowers grouped on

elongated cymes.


Univalent, unsaturated organic radical C3H5.


Bitter, yellow crystalline compound from aloe, used as a laxative.


Double sulfates of a trivalent metal such as aluminum, chromium, or iron

and a univalent metal such as potassium or sodium, especially aluminum

potassium sulfate, AlK(SO4)2 12H2O, widely used in industry as

clarifiers, hardeners, and purifiers and medicinally as topical

astringents and styptics.