The following two designations appear in some chemical names where there are asymmetric carbon atoms (these molecules are called optical isomers or stereoisomers).

  • L (levo-): Left-handed
  • D (dextro-): Right-handed

The particular designation given to a molecule depends upon the direction the plane of polarized light is rotated by the molecule.

Related: Sinistral (left of or facing the left), sinistrorse (turned toward the left), Dextral, Dexter (right) sinister (on the left).

More information at Dictionary.com.

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