תַּנִּין tannîyn (H8577)

a marine or land monster, i.e. sea-serpent or jackal

1) dragon, serpent, sea monster 1a) dragon or dinosaur 1b) sea or river monster 1c) serpent, venomous snake

or תַּנִּים; (Ezekiel 29:3), intensive from the same as תַּן (H8565);