physical chemistry. pertaining to or having photochemical properties resulting from an impurity or from exposure to radiation.
mineralogy. (of a mineral) having no color in itself but bearing colored impurities.

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  • Allochthon

    a geological formation not formed in the region where found and moved to its present location by tectonic forces. compare (def 3).

  • Allochthonous

    not formed in the region where found. compare (def 4). adjective (of rocks, deposits, etc) found in a place other than where they or their const-tuents were formed compare autochthonous (sense 1)

  • Allocution

    a formal speech, especially one of an incontrovertible or hortatory nature. a pr-nouncement delivered by the pope to a secret consistory, especially on a matter of policy or of general importance. historical examples this allocution calls to mind spainʼs last struggle with mexico. the philippine islands john foreman he began with an allocution pitched in […]

  • Allocortex

    allocortex allocortex al·lo·cor·tex (āl’ō-kôr’těks’) n. any of the regions of the cerebral cortex that have fewer cell layers than the isocortex, especially the olfactory cortex and the hippocampus. also called heterotypic cortex.

  • Allod

    land owned absolutely; land owned and not subject to any rent, service, or other tenurial right of an overlord. historical examples the allod or domain of the family was the joint-property of the father and his sons. ancient law sir henry james sumner maine noun (pl) -lodia (-ˈləʊdɪə), -lods (history) lands held in absolute ownership, […]

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