FROM STRONG’S HEBREW DICTIONARY (1890)

Strong’s Hebrew Dictionary (1890) — public domain, printed whole.

tanniyn tan-neen' — or tanniym (Ezek. 29:3) {tan-neem'}; intensive from the same as 8565; a marine or land monster, i.e. sea-serpent or jackal:--dragon, sea-monster, serpent, whale.

see HEBREW for 08565