Deck

From MTG Salvation Wiki

Deck can have two different meanings. The first is the collection of cards that a player plays with. The second, decked, is a slang term meaning "to run out of cards" by being "milled" for example.

From the Comprehensive Rules Deck A player’s deck is the collection of cards that player starts the game with. When the game begins, each player’s deck becomes his or her library. See section 100, “General,” and section 101, “Starting the Game.” 100.4. There is no maximum deck size.