Harry Fitch Kleinfelter har·ry·fitchk·leinfelter uncommon noun 1. United States physician who first described the XXY-syndrome (born in 1912) SynonymsKlinefelterHarry F. KlinefelterHarry Fitch Kleinfelter Related words Broader terms doctor WordNet 2.1 (Princeton University). WordNet 2.1 Copyright Princeton University. All rights reserved.