Tunicin n. (Physiol. Chem.) Animal cellulose; a substance present in the mantle, or tunic, of the Tunicates, which resembles, or is identical with, the cellulose of the vegetable kingdom.
... neither locomotion nor irritability is peculiar to animals; since many insectivorous plants habitually digest solid food; since cellulose, that most characteristic of vegetable products, is practically identical with the tunicin of Ascidians, it becomes of the greatest interest to know whether the chlorophyl of animals preserves its ordinary vegetable function of effecting or aiding the decomposition of carbonic anhydride and the synthetic production ... — Scientific American Supplement, No. 324, March 18, 1882 • Various
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