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Base

/bās/ Noun 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. (biology-online.org) 2. Base of the heart, a portion of the heart opposite the apex of the heart. (wikipedia.org) 3. (Botany, Zoology) a. The part of an organ nearest its point of attachment. b. The point of...

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Base

/bās/ Noun, pl. bases 1. (Science: 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. (biology-online.org) 2. A substance that can accept hydrogen cations (protons) or more generally, donate a pair of valence electrons. (wikipedia.org) 3. (Anatomy) The part of an organ nearest its point of attachment) “the base of the skull.” (wordnetweb.princeton.edu) 4. (Nucleotide, base) A phosphoric ester of a nucleoside; the basic structural unit of nucleic acids (DNA or RNA). (wordnetweb.princeton.edu) 5. A purine or pyrimidine group in a nucleotide or nucleic acid. (Google...

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