The Collaborative International Dictionary
Proface
Proface \Pro"face\, interj. [OF. prou face, prou fasse; prou profit + faire to make, do.] Much good may it do you! -- a familiar salutation or welcome.
Master page, good master page, sit. Proface!
--Shak.
Wiktionary
proface
interj. (context obsolete English) Much good may it do you! — a familiar salutation or welcome.