a positive photographic image produced on a transparent film or glass base.
Origin of diapositive
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Diapositive, dī-a-poz′i-tiv, n. a transparent photographic positive, such as a lantern slide.
a positive transparency; slide
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012