User blog comment:Ralok/XenoBiological Studies wiki/@comment-5061831-20120318051341/@comment-824313-20120318072142

The internet says it comes from greek: [~] is a prefix based on the Greek word "Xenos", meaning stranger. In biology, it is often used to designate species-difference. Xeno Factors refers the phenomenon of cross-species benefit from polyphenols such as resveratrol. See Xenohormesis.