planktonic

• planktic
• planctonic (misspelling)

From plankton +‎ -ic, after German planktonisch.

• (UK) IPA^(key): /plaŋkˈtɒnɪk/
• (US) IPA^(key): /plæŋkˈtɑnɪk/
• Rhymes: -ɒnɪk

planktonic (not comparable)

1. Of or pertaining to plankton.
   • 2004, Richard Fortey, The Earth, Folio Society, published 2011, page 146:

     Tiny shells of planktonic animals rain down from the surface waters of the ocean on to the deep sea-floor.

2. Floating in the open sea rather than living on the seafloor.

• benthic
• oceanic
• pelagic