the GNU version of the Collaborative International Dictionary of English
Whatsoever; whosoever; whatever; anything that.
The Century Dictionary and Cyclopedia
Of whatever character, kind, or sort; no matter what (person or thing): an indefinite relative use.
No matter what or who; whatsoever; whosoever.
Sometimes written as two separate words.
Word Usage
"Replied Nur al-Huda, By Allah, O my sister, thou sayest sooth in whatso thou tellest me of the marvels which this man hath seen and suffered; and none may fail of respect to him."