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The ornamental Chinese tree Ginkgo biloba, also called the maidenhair tree, the dominant species of tree some 200 million years ago, before the conifers and broadleaved trees we know today had evolved, highly resistant to virus infection, fungi, and effects of pollution and radiation. Also, a herbal substance prepared from it and taken for its alleged nootropic effect of slowing intellectual decline in old age or as an aphrodisiac. Also spelt gingko. See also smart drug. [From Japanese ginkyo, from Chinese yin silver + hing apricot]

Subjects: Science and Mathematics.

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