polyunsaturated fatty acid: an unsaturated fatty acid whose carbon chain has more than one double or triple valence bond per molecule; found chiefly in fish and corn and soybean oil and safflower oil
unsaturated fatty acid: a fatty acid whose carbon chain can absorb additional hydrogen atoms
talc: a fine grained mineral having a soft soapy feel and consisting of hydrated magnesium silicate; used in a variety of products including talcum powder