Judas is primarily known as the name of Judas Iscariot, one of the twelve apostles who betrayed Jesus Christ for thirty pieces of silver.
The term "Judas" has evolved to mean:
1. A traitor or betrayer
2. A peephole in a door (called a "Judas hole")
3. A type of tree (Judas tree) that is said to be the tree from which Judas hanged himself
4. A given name in some cultures