• Webster's Revised Unabridged Dictionary
    • Horsechestnut (Bot) The large nutlike seed of a species of Æsculus Æsculus Hippocastanum), formerly ground, and fed to horses, whence the name. The seed is not considered edible by humans.
    • Horsechestnut (Bot) The tree itself (Aesculus hippocastanum), which was brought from Constantinople in the beginning of the sixteenth century, and is now common in the temperate zones of both hemispheres; it has palmate leaves and large clusters of white to red flowers followed by brown shiny inedible seeds. The native American species is also called buckeye and conker.
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In literature:

Let them arrange Flax, Four o-clock, Horsechestnut, Almond, Nasturtium, Maple-seeds, etc., under two heads.
"Outlines of Lessons in Botany, Part I; From Seed to Leaf" by Jane H. Newell
Here lived Emerson, in the two-story drab house, with horsechestnut-trees in front of it.
"Lives of Girls Who Became Famous" by Sarah Knowles Bolton
Value for planting: On account of its showy flowers, the horsechestnut is a favorite for the park and lawn.
"Studies of Trees" by Jacob Joshua Levison
Horsechestnuts extracted and distilled might possibly provide something as bitter.
"The Meaning of Evolution" by Samuel Christian Schmucker
Roses, White Thorn, Horsechestnut 4 months.
"American Pomology" by J. A. Warder

In news:

It doesn't have the problems that afflict some other horsechestnuts.