From pre- + lunch.
prelunch (not comparable)
- before lunch
2009 August 28, Jeremy W. Peters, “Crowds, Butter Sculpture and No Polls: State Fair Is a Pick-Me-Up for Paterson”, in New York Times[1]:He sampled state fair delicacies — a vanilla milkshake for a prelunch snack, followed by a sausage sandwich with peppers and onions.