From HomoExcelsior

1. A circular protuberance or knoblike swelling, as on the horns of certain animals. 2. A raised area used as ornamentation. 3. A raised ornament, such as one at the intersection of the ribs in a vaulted roof. 4. An enlarged part of a shaft to which another shaft is coupled or to which a wheel or gear is keyed. 5. A hub, especially of a propeller. 6. To emboss.

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