Meaning: A huge monster. A dinosoar. A creature belonging to a time long past.
Example: He had to work within the culture of the corporate behmoth.
Job 40:15-24
Behold now behemoth, which I made with thee; he eateth grass as an ox. [16] Lo now, his strength is in his loins, and his force is in the navel of his belly. [17] He moveth his tail like a cedar: the sinews of his stones are wrapped together. [18] His bones are as strong pieces of brass; his bones are like bars of iron. [19] He is the chief of the ways of God: he that made him can make his sword to approach unto him. [20] Surely the mountains bring him forth food, where all the beasts of the field play. [21] He lieth under the shady trees, in the covert of the reed, and fens. [22] The shady trees cover him with their shadow; the willows of the brook compass him about. [23] Behold, he drinketh up a river, and hasteth not: he trusteth that he can draw up Jordan into his mouth. [24] He taketh it with his eyes: his nose pierceth through snares.