1. [n]  monstrous sea creature symbolizing evil in the Old Testament
2. [n]  the largest or most massive thing of its kind; "it was a leviathan among redwoods"; "they were assigned the leviathan of textbooks"

Leviathan
The protagonist of this novel is a writer named Benjamin Sachs who is widely considered to be brilliant, witty, and talented. As the novel opens, he is blown to bits while attempting to manufacture a bomb on a snowy road in Wisconsin. How he came to this abrupt, untimely end is the ostensible topic that the imaginary author of the present novel, Sachs`s old friend, Peter Aaron, is investigating. Aaron is searching for the truth, lest the authorities hold Sachs responsible for a series of bombings of replicas of the Statue of Liberty throughout the United States. Could Benjamin Sachs have been one of this secret malignant, secret group?

more details ...

a transliterated Hebrew word (livyathan), meaning "twisted," "coiled." In Job 3:8, Revised Version, and marg. of Authorized Version, it denotes the dragon which, according to Eastern tradition, is an enemy of light; in 41:1 the crocodile is meant; in Ps. 104:26 it "denotes any large animal that moves by writhing or wriggling the body, the whale, the monsters of the deep." This word is also used figuratively for a cruel enemy, as some think "the Egyptian host, crushed by the divine power, and cast on the shores of the Red Sea" (Ps. 74:14). As used in Isa. 27:1, "leviathan the piercing [R.V. 'swift'] serpent, even leviathan that crooked [R.V. marg. 'winding'] serpent," the word may probably denote the two empires, the Assyrian and the Babylonian.