nek·ton 
(nĕktən, -tŏn′)
(nĕktən, -tŏn′)n.
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.
[Greek nēkton, neuter of nēktos, swimming, from nēkhein, to swim; see snā- in the Appendix of Indo-European roots.]
nek·tonic (-tŏnĭk) adj.
- Indo-European root: sper-
- Indo-European root: sperə-
- Indo-European root: spē-
- Indo-European root: sreu-
- Indo-European root: (s)teg-
- Indo-European root: stegh-
- Indo-European root: steig-
- Indo-European root: steigh-
- Indo-European root: stel-
- Indo-European root: (s)tenə-
- Indo-European root: ster-
- Indo-European root: ster-
- Indo-European root: ster-
- Indo-European root: streb(h)-
- Indo-European root: streig-
- Indo-European root: stā-
- Indo-European root: stāi-
- Indo-European root: s(w)e-
- Indo-European root: sweid-
- Indo-European root: s(w)eks
- Indo-European root: swel-
- Indo-European root: swen-
- Indo-European root: swep-
- Indo-European root: swer-
- Indo-European root: swesor-