horn
noun
one of the bony, permanent, hollow paired growths, often curved and pointed, that project from the upper part of the head of certain hooved mammals, as cattle, sheep, goats, or antelopes.
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Sheep have been produced combining the excellent mutton qualities of one breed with the hornlessness of another, and with the fine wool qualities of still a third.
From The Social Direction of Evolution An Outline of the Science of Eugenics by Kellicott, William E.