anoxygenic

adjective
an·ox·y·gen·ic

Definition of anoxygenic 

: being or carrying out photosynthesis in which oxygen is not produced as a by-product anoxygenic purple bacteria

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First Known Use of anoxygenic

1975, in the meaning defined above

History and Etymology for anoxygenic

an- + oxygenic

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The first known use of anoxygenic was in 1975

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