Dragon in the Bible

A poisonous serpent

Deuteronomy 32:33 Their wine is the poison of dragons, and the cruel venom of asps.

⇒Bible Encyclopedia for DRAGON.

A serpent or the desert

Psalm 91:13 Thou shalt tread upon the lion and adder: the young lion and the dragon shalt thou trample under feet.
Isaiah 34:13 And thorns shall come up in her palaces, nettles and brambles in the fortresses thereof: and it shall be an habitation of dragons, and a court for owls.
Jeremiah 9:11 And I will make Jerusalem heaps, and a den of dragons; and I will make the cities of Judah desolate, without an inhabitant.
Jeremiah 51:37 And Babylon shall become heaps, a dwellingplace for dragons, an astonishment, and an hissing, without an inhabitant.
Malachi 1:3 And I hated Esau, and laid his mountains and his heritage waste for the dragons of the wilderness.

⇒Definition of dragon

Of the sea

Psalm 74:13 Thou didst divide the sea by thy strength: thou brakest the heads of the dragons in the waters.
Isaiah 27:1 In that day the LORD with his sore and great and strong sword shall punish leviathan the piercing serpent, even leviathan that crooked serpent; and he shall slay the dragon that is in the sea.

A wolf

Micah 1:8 Therefore I will wail and howl, I will go stripped and naked: I will make a wailing like the dragons, and mourning as the owls.

Interpreted as whale, in

Genesis 1:21 And God created great whales, and every living creature that moveth, which the waters brought forth abundantly, after their kind, and every winged fowl after his kind: and God saw that it was good.
Job 7:12 Am I a sea, or a whale, that thou settest a watch over me?

Serpent

Exodus 7:9 When Pharaoh shall speak unto you, saying, Shew a miracle for you: then thou shalt say unto Aaron, Take thy rod, and cast it before Pharaoh, and it shall become a serpent.

A term applied

To Pharaoh

Isaiah 51:9 Awake, awake, put on strength, O arm of the LORD; awake, as in the ancient days, in the generations of old. Art thou not it that hath cut Rahab, and wounded the dragon?

To Satan

Revelation 20:2 And he laid hold on the dragon, that old serpent, which is the Devil, and Satan, and bound him a thousand years,

Symbolical

Ezekiel 29:3 Speak, and say, Thus saith the Lord GOD; Behold, I am against thee, Pharaoh king of Egypt, the great dragon that lieth in the midst of his rivers, which hath said, My river is mine own, and I have made it for myself.
Ezekiel 32:2 Son of man, take up a lamentation for Pharaoh king of Egypt, and say unto him, Thou art like a young lion of the nations, and thou art as a whale in the seas: and thou camest forth with thy rivers, and troubledst the waters with thy feet, and fouledst their rivers.
Revelation 12 And there appeared a great wonder in heaven; a woman clothed with the sun, and the moon under her feet, and upon her head a crown of twelve stars: 2 And she being with child cried, travailing in birth, and pained to be delivered. 3 And there appeared another wonder in heaven; and behold a great red dragon, having seven heads and ten horns, and seven crowns upon his heads. 4 And his tail drew the third part of the stars of heaven, and did cast them to the earth: and the dragon stood before the woman which was ready to be delivered, for to devour her child as soon as it was born. ...
Revelation 13 And I stood upon the sand of the sea, and saw a beast rise up out of the sea, having seven heads and ten horns, and upon his horns ten crowns, and upon his heads the name of blasphemy. 2 And the beast which I saw was like unto a leopard, and his feet were as the feet of a bear, and his mouth as the mouth of a lion: and the dragon gave him his power, and his seat, and great authority. 3 And I saw one of his heads as it were wounded to death; and his deadly wound was healed: and all the world wondered after the beast. 4 And they worshipped the dragon which gave power unto the beast: and they worshipped the beast, saying, Who is like unto the beast? who is able to make war with him? ...
Revelation 16:13 And I saw three unclean spirits like frogs come out of the mouth of the dragon, and out of the mouth of the beast, and out of the mouth of the false prophet.