What is (a) A bitter principle obtained from dogwood (Cornus florida), as a white crystalline substance; -- called also cornic acid. (b) An extract from dogwood used as a febrifuge called?

cornin — (a) A bitter principle obtained from dogwood (Cornus florida), as a white crystalline substance; -- called also cornic acid. (b) An extract from dogwood used as a febrifuge. (Webster's 1913.)

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