Omaha Poker: Terminology

Pocket:
The two "hole" cards dealt to each player, face down. 

Flop:
The first three communal cards. 

Turn:
The fourth communal card dealt. 

River:
The fifth (and final) communal card dealt. 

Button/Buck/Puck:
A moving disc that determines the player in the dealing position for each hand. This player is the last one to act in the hand. The button moves from player to player in a clockwise direction after each hand is dealt.