nekton

n. 自泳动物

形容词:nektonic 

nek.ton

n.（名词）
The collection of marine and freshwater organisms that can swim freely and are generally independent of currents, ranging in size from microscopic organisms to whales.
自泳生物：能自由游动且不依靠水流的海中和淡水生物的总称，包括微生物乃至鲸鱼

来源：
Greek nôkton [neuter of] nôktos [swimming]
希腊语 nôkton [] nôktos的中性 [游动着]
from nôkhein [to swim] * see sn3-
源自 nôkhein [游动] *参见 sn3-

【引伸】
nekton.ic