a cultivated plant, Armoracia rusticana, of the mustard family, having small, white flowers.
the pungent root of this plant, ground and used as a condiment and in medicine.
the condiment itself, sometimes moistened with vinegar or mixed with ground beets.
of or containing ground horseradish as a flavoring: brisket of beef with horseradish sauce.

1590–1600; horse + radish Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
horseradish (ˈhɔːsˌrædɪʃ)
1.  a coarse Eurasian plant, Armoracia rusticana, cultivated for its thick white pungent root: family Brassicaceae (crucifers)
2.  the root of this plant, which is ground and combined with vinegar, etc, to make a sauce

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin & History

1597, Cochlearia armoricia, the common name preserves the once-common figurative sense of horse as "strong, large, coarse" (e.g. in obs. horse mushroom, horse parsley, etc.).
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Also add several pieces of fresh, cleaned horseradish, and a whole cleaned and
  peeled red beet.
Canned beets may be used in place of fresh ones, and bottled horseradish if of
  strong flavor and well drained.
The house specialty is the extra-hot horseradish and the pizza.
For a side, order the horseradish mashed potatoes, another specialty.
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