Strong's H3882לִוְיָתָן: a wreathed animal, i.e. a serpent (especially the crocodile or some other large sea-monster); figuratively, the constellation of the dragon; also as a symbol of Babylon KJV:leviathan, mourning.
Meanings: Brown-Driver-Briggs (1906) and Strong's Hebrew Dictionary (1890), public domain, via the Open Scriptures Hebrew Bible Project (CC BY 4.0). TWOT numbers for reference only.
Root family 1089: לוהlwh — turn, twist, wind, surround, encircle