photopositive

adjective
pho·to·pos·i·tive | \ ˌfō-tō-ˈpä-zə-tiv , -ˈpäz-tiv \

Definition of photopositive 

: exhibiting positive phototropism or phototaxis

First Known Use of photopositive

1914, in the meaning defined above

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The first known use of photopositive was in 1914

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occurring twice a year or every two years

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