A hand with which you expect to be on a draw is a drawing hand. Suited connectors in hold'em (e.g., QhJh) are drawing hands, since while they make strong hands (straights and flushes) relatively often, they will rarely make them on the flop.
In any game, an incomplete hand which is not likely to win unless future cards, received by whatever means the game specifies, improve it. For example, having four club-suited cards but no pair in a stud game, hoping that one of the cards to come will be a fifth club, making a flush. See draw.