/hoohz'soh ev"euhr/ , pron.
1. (the possessive case of whosoever used as an attributive adjective): Whosesoever books are overdue will be fined.
2. the one or ones belonging to whomsoever: Whosesoever are left here will be confiscated.
[ 1605-15; earlier whoseso whosesoever (see WHOSE, SO 1 ) + EVER ]