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actino-chemistry

ˈactino-ˈchemistry
  [See actino-.]
  The chemistry of actinism; that branch of chemistry, which treats of the chemical energies existing in the solar rays.

1844 Sir J. Herschel Brit. Assoc. Report 12, A contribution to the newly created science of actino-chemistry. 1853 R. Hunt Man. Photog. 116 Proceeding only to the more delicate processes when he has mastered the rudimentary details of the more simple forms of actino-chemistry. 1875 Ure Dict. Arts I. 28 Actino-chemistry was a term first applied by Sir John Herschel, and has been generally adopted.

Oxford English Dictionary

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