The Collaborative International Dictionary of English v.0.48:
halfpennyworth \halfpennyworth\ n. the amount that can be bought for a halfpenny. Syn: ha'p'orth. [WordNet 1.5]WordNet (r) 3.0 (2006):
halfpennyworth n 1: the amount that can be bought for a halfpenny [syn: halfpennyworth, ha'p'orth]