noun

• (biblical) First son of Jacob, by his wife Leah.
• A male given name from Hebrew.
• A surname transferred from the given name
• A grilled or toasted sandwich made with corned beef, sauerkraut, Swiss cheese, and either Russian dressing or Thousand Island dressing.
• (biblical) A member of one of the Israelite tribes, descended from Reuben.
• (Oxford University, informal) Ellipsis of Reuben College, Oxford.