a positive photographic image produced on a transparent film or glass base.

1890–95; dia- + positive

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World English Dictionary
diapositive (ˌdaɪəˈpɒzɪtɪv)
a positive transparency; slide

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
The diapositive is inspected to insure clarity and radiometric uniformity.
The diapositive is inspected to ensure clarity and radiometric uniformity.
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