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"containing tin," 1790, from Modern Latin stannum, from Late Latin stannum "tin" (earlier "alloy of silver and lead"), a scribal alteration of Latin stagnum, probably from a Celtic source (cf. Irish stan "tin," Cornish and Breton sten, Welsh ystaen). The Latin word is the source of Italian stagno, French étain, Spanish estaño "tin."
stannic stan·nic (stān'ĭk)
Of, relating to, or containing tin, especially with valence 4.
Containing tin, especially tin with a valence of 4. Compare stannous.