From nacak in the sense of spreading out; something expanded, i.e. The warp in a loom (as stretched out to receive the woof) -- web.
see HEBREW nacak
H4545. masseketh
[מַסֶּ֫כֶת] noun feminine web of unfinished stuff, on loom (see GFMPAOS, Oct. 1889, clxxvii); — only absolute מַסָּ֑כֶת Judges 16:13-14,. — מְסֻכָה מָסָךְ, see סכך.