Someone who fantasizes about or is specifically aroused by the idea of having sex with someone who has an amputated limb. There is documentation of both men and women with this fetish.
People with this sexual interest or fetish are often referred to (and refer to themselves as) devotees. But devotees may be interested in people living with other kinds of disabilities, not just people with amputations.
Love, B. Encyclopedia of Unusual Sex Practices. London: Greenwich Editions, 2001.