bac·​te·​rio·​plank·​ton | \ bak-ˌtir-ē-ō-ˈplaŋ(k)-tən How to pronounce bacterioplankton (audio) , -ˌtän\

Definition of bacterioplankton

: plankton composed of bacteria … a 2-year study off the New Jersey coast detected seasonal patterns of bacterioplankton communities with distinct clusters of samples separated by season for each year and a distinction between summer and winter communities evident in the entire data set.— Stephen J. Giovannoni and Kevin L. Vergin, Science, 10 Feb. 2012

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First Known Use of bacterioplankton

1923, in the meaning defined above

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The first known use of bacterioplankton was in 1923

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