The Collaborative International Dictionary of English v.0.48:
handsbreadth \handsbreadth\ n. any unit of length based on the breadth of the human hand. Syn: handbreath. [WordNet 1.5]WordNet (r) 3.0 (2006):
handsbreadth n 1: any unit of length based on the breadth of the human hand [syn: handbreadth, handsbreadth]