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Meaning of allochromatic

al•lo•chro•mat•ic

Pronunciation: (al"u-kru-mat'ik, -krō-), [key]
— adj.
  1. pertaining to or having photochemical properties resulting from an impurity or from exposure to radiation.
  2. (of a mineral) having no color in itself but bearing colored impurities. Cf. idiochromatic.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.