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1. (Chemistry)
The nonacid part of a salt, a substance that combines with acids to form salts, a substance that dissociates to give hydroxide ions in aqueous solutions, a substance whose molecule or ion can combine with a proton (hydrogen ion), a substance capable of donating a pair of electrons (to an acid) for the formation of a coordinate covalent bond. (

2. Base of the heart, a portion of the heart opposite the apex of the heart. (

3. (Botany, Zoology)
a. The part of an organ nearest its point of attachment.
b. The point of attachment.

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