Definitions

1. adjective

relating to or being a member of plankton, especially small marine organisms that drift in the water.

“The planktonic organisms in the ocean play a crucial role in the marine food chain.”

2. adjective

relating to or being plankton, especially small marine organisms that drift in the water.

“The planktonic life in the aquarium was thriving.”

3. noun

the plankton of a particular body of water, especially at a particular time or in a particular season.

“The planktonic population in the lake increased significantly during the spring.”