stereoisomer (ster´e-o-I´so-mer)

A molecule containing the same number and kind of atom groupings as another but in a different arrangement in space; the stereoisomers are not interconvertible unless bonds are broken and reformed; by virtue of which it exhibits different optical properties; e.g., as between d and l amino acids, 5a and 5beta steroids. Cf. isomer. [stereo- + G. isos, equal, + meros, part]


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