[dahy-uh-ster-ee-uh-mer, -steer-]
noun Chemistry.
either of a pair of stereoisomers that are not mirror images of each other.
Also called diastereoisomer [dahy-uh-ster-ee-oh-ahy-suh-mer, -steer-] .
Compare enantiomer.

1935–40; dia- + stereo(iso)mer

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