Proto-Indo-European root meaning "to bind, tie."
It forms all or part of: annex; annexation; connect; connection; denouement; net (n.) "netting, network, mesh used for capturing;" nettle; nexus; node; nodule; noose.
It is the hypothetical source of/evidence for its existence is provided by: Sanskrit nahyati "binds, ties;" Latin nodus "knot;" Old Irish nascim "I bind, oblige;" Old English net "netting, network."