Pot odds are the payout offered by the pot expressed in comparison to the price to call a bet. For example, if there was $100 in the pot and the player had to put in $20, the pot was offering 5-to-1 odds. These odds were then compared to the likelihood the player making the decision would win the hand, either by having the best cards or drawing to the best hand.
Michael Craig in The Professor, the Banker, and the Suicide King