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planktonic (adjective), more planktonic, most planktonic
Relating to, being, or characteristic of very small organisms that float: "Most whales and many fishes live entirely upon planktonic creatures which are small and not self movable or that are feebly swimming organisms near the surface of the water, straining them off from the water they take in as they swim along with open mouths."
—Compiled from The Principles of General Biology
by Mary S. Gardiner and Sarah C. Flemister; The MacMillan Co.;
New York; 1967; page 408.
This entry is located in the following unit: plankto-, plankt-, -plankton (page 5)