Cur"cu*min (-m?n), n. (Chem.) The coloring principle of turmeric, or curcuma root, extracted as an orange yellow crystalline substance, C₁₄H₁₄O₄, with a green fluorescence.

&fist; It possesses acid properties and with alkalies forms brownish salts. This change in color from yellow to brown is the characteristic reaction of tumeric paper. See Turmeric paper, under Turmeric.