Planktonic animals (chiefly minute crustaceans) upon which right whales feed, esp. as seen floating on the surface. Also more fully sea-brit. Now…

Plankton found in fresh water.

With singular or plural agreement. Plankton consisting of small animals and the immature stages of larger animals. Cf. phytoplankton, n.

Aquatic organisms that spend only part of their life cycle as plankton; meroplanktonic organisms collectively.

Plankton found in rivers or streams.

With singular or plural agreement. Marine organisms which live among or are attached to drifting or floating objects.

small and microscopic organisms (esp. algae) that inhabit snow and ice; cf. cryophyte n.

plankton found in the layer of water directly above the bottom of the ocean.

Microscopic or very small plankton.

marine plankton.

a collective term for aquatic organisms that are holoplanktonic.

Planktonic organisms of the neritic zone. rare.

Very small unicellular plankton, at the limits of resolution of light microscopy.

The minute organisms inhabiting the surface layer of water or moving on the surface film, considered collectively.

= aerial plankton n. at aerial, adj. compounds.

= staphylococcus, n., a genus of pathogenic bacteria.

hypothetical living material such as microorganisms or spores present in space, postulated as able to initiate or spread life on reaching a…

Plankton consisting of organisms between 0.2 and 2.0 microns in diameter, or having a wet weight of the order of 10−12 g.