noun alkannin a dark red, amorphous, water-insoluble powder, C 16 H 16 O 5 , obtained from the root of the alkanet: used chiefly for coloring fats, oils, and pharmaceuticals. 1
noun alkannin A natural dye and naphthoquinone derivative obtained from the borage plant Alkanna tinctoria, used as a food colouring and in cosmetics. 0
