Webster's Dictionary 
(n.) A very large American moth (Telea polyphemus) belonging to the Silkworm family (Bombycidae). Its larva, which is very large, bright green, with silvery tubercles, and with oblique white stripes on the sides, feeds on the oak, chestnut, willow, cherry, apple, and other trees. It produces a large amount of strong silk. Called also American silkworm.
Cyclopedia of Biblical, Theological and Ecclesiastical Literature 
in the Homeric mythology, the son of Poseidon and the nymph Thoosa, the most celebrated of the fabulous Cyclopes who inhabited the island of Sicily. He was of immense size, and had only one eye. When Ulysses landed on that island he entered the cave of Polyphemus with twelve companions, of which number this tremendous cannibal ate six. The others stood expecting the same fate, but their cunning leader made Polyphemus drunk, then burned out his single eye with a blazing torch, and so escaped, leaving the blinded monster to grope about in the darkness.
The Nuttall Encyclopedia 
In Homeric legend a son of Neptune, the most celebrated of the Cyclops, a huge monster with one eye, who dwelt in Sicily in a cave near Ætna, and whose eye, after making him drunk, Ulysses burnt out, lest he should circumvent him and devour him, as he had done some of his companions.