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| an arrangement of five objects, as trees, in a square or rectangle, one at each corner and one in the middle. |
| a chattering or flighty, light-headed person. |
| plankton (ˈplæŋktən) | |
| —n | |
| Compare nekton the organisms inhabiting the surface layer of a sea or lake, consisting of small drifting plants and animals, such as diatoms | |
| [C19: via German from Greek planktos wandering, from plazesthai to roam] | |
| planktonic | |
| —adj | |
| plankton (plāngk'tən) Pronunciation Key
Small organisms that float or drift in great numbers in bodies of salt or fresh water. Plankton is a primary food source for many animals, and consists of bacteria, protozoans, certain algae, cnidarians, tiny crustaceans such as copepods, and many other organisms. Compare benthos, nekton. |