Medical Definition of base
plural bases \ˈbā-səz\play
1: that portion of a bodily organ or part by which it is attached to another more central structure of the organism <the base of the thumb>
2a: the usually inactive ingredient of a preparation serving as the vehicle for the active medicinal preparation <the fatty base of an ointment>b: the chief active ingredient of a preparation—called also
3a: any of various typically water-soluble and bitter tasting compounds that in solution have a pH greater than 7, are capable of reacting with an acid to form a salt, and are molecules or ions able to take up a proton from an acid or are substances able to give up an unshared pair of electrons to an acid—compare alkalib: any of the five purine or pyrimidine bases of DNA and RNA that include cytosine, guanine, adenine, thymine, and uracil
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