Pronunciation: (hOOz"sō-ev'ur), [key]
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.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.