planktonic

Etymology

From plankton + -ic, after German planktonisch.

adj

  1. Of or pertaining to plankton.
    Tiny shells of planktonic animals rain down from the surface waters of the ocean on to the deep sea-floor. 2004, Richard Fortey, The Earth, Folio Society, published 2011, page 146
  2. Floating in the open sea rather than living on the seafloor.

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