The Collaborative International Dictionary of English v.0.48:
one-hand \one"-hand`\, one-handed \one`-hand"ed\, a. Employing one hand; as, the one-hand alphabet. See Dactylology. [1913 Webster]WordNet (r) 3.0 (2006):
one-handed adj 1: having or using a single hand; "one-handed golfers"; "a one-handed backetball shot"