The Collaborative International Dictionary of English v.0.48:
Handbreadth \Hand"breadth`\ (-br[e^]dth`), n. A space equal to the breadth of the hand; a palm. --Ex. xxxvii. 12. Syn: handsbreadth. [1913 Webster]WordNet (r) 3.0 (2006):
handbreadth n 1: any unit of length based on the breadth of the human hand [syn: handbreadth, handsbreadth]