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ACTH
actin
actin-
actinal
acting
actinian
actinic
actinide
actinism
actinium
actino-
actinolite
actinometer
actinomorphic
actinomycete
actinomycin
actinomycosis
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actinism
ac·tin·ism [ áktə nìzzəm ]


noun 
Definition:
 
photochemical effect: the property of radiation that makes photochemical change possible
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