noun

• (archaic or poetic) Any creeping or crawling animal, such as a snake, snail, or caterpillar.
  "1561, Geneva Bible, Acts 28:3-4, And when Paul had gathered a nomber of stickes, & laid them on the fyre, there came a viper out of the heat, and leapt on his hand. Now when the Barbarians sawe the worme hang on his hand, they said among them selues This man surely is a murtherer, whome, thogh he hathe escaped the sea, yet Vengeance hathe not suffred to liue."
• (archaic) A type of wingless "dragon", especially a gigantic sea serpent or any kind of dragon.
  "In the Cross of Cong (A.D. 1123) the Celtic inter-laced patterns are found side by side with the "worm-dragon" ornament .."
• (archaic) A type of wingless "dragon", especially a gigantic sea serpent or any kind of dragon.
• (computing) A self-replicating program that propagates through a network, differing from a virus in usually lacking any destructive effects.
  "When Trevor opened his email, a worm spread to 100 people in his address book."

verb

• (transitive) To make (one's way) with a crawling motion.
  "We wormed our way through the underbrush."
• (intransitive) To move with one's body dragging the ground.
  "Inch by inch I wormed along the secret passageway, flat to the ground, not once raising my head, hardly daring to pull a full breath[…]."
• (intransitive, figuratively) To work one's way by artful or devious means.
  "When debates and fretting jealousy / Did worm and work within you more and more, / Your colour faded."
• (transitive, figuratively) To work (one's way or oneself) (into) gradually or slowly; to insinuate.
  "He wormed his way into the organization."

noun

• (computing, computer hardware) Initialism of write once, read many.