photonegative

adjective
pho·​to·​neg·​a·​tive | \ ˌfō-tō-ˈne-gə-tiv How to pronounce photonegative (audio) \

Definition of photonegative

: exhibiting negative phototropism or phototaxis

First Known Use of photonegative

1914, in the meaning defined above

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The first known use of photonegative was in 1914

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