Dictionary.net

pas'-par-t[=oo]', n. a means of passing anywhere: a master-key: a kind of simple picture-frame, usually of pasteboard, within which the picture is fixed by strips of paper pasted over the edges. [Fr., a 'master-key,' from passer, to pass, par, over, tout, all.]

Master-key; mount for photograph &c. [French]

[Fr.] A master-key.

[Fr.] An engraving of an ornamental border, on metal or wood, the centre of which was cut out to allow the insertion of another engraving to which the border formed a frame.