Should "Feldenkrais" even be allowed to be a word in the spelling bee? It's a trademark derived from a surname that was created to be a source identifier rather than a generic term in the public domain. It's no different than, for instance, "McNuggets", "Viagra," or "Microsoft," which are all invented terms intended to identify specific products or services and, like "Feldenkrais," do not have a real definition. They are brands, not words.
Rich
"Failure is Not a Destination"
Coach K on the Dan Patrick Show, December 22, 2016