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selenio-

seˈlenio- Chem.
  Also seleno-.
  Used as a combining form of selenium.

1831 T. Thomson Chem. (ed. 7) II. 249 Seleniocyanogen..was discovered by Berzelius. 1836 Brande Chem. (ed. 4) 570 Seleniocyanuret of Potassium. [1848 Ibid. (ed. 6) I. 602 Seleniocyanide.] 1853 Watts tr. Gmelin's Hand-bk. Chem. VIII. 122 Selenocyanide of lead. Ibid., Selenocyanide of Ammonium. 1868Dict. Chem. V. 219 Seleniocyanates. Ibid., Seleniocyanic Acid.

Oxford English Dictionary

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