Pronunciation: (ôr'su-nôl", -nol"), [key]
a white, crystalline, water-soluble solid, C7H8O2, sweet but unpleasant in taste, that reddens on exposure to air: obtained from many lichens or produced synthetically and used chiefly as a reagent for certain carbohydrates. Also,or•cinPronunciation: (ôr'sin). [key]
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.