BT Ket 79b(6) :פירא תיקנו ל^י^ה רבנן פירא דפירא לא תקינו רבנן‏ : the scholars designated the usufruct for him [i.e. the husband]. They did not designate the usufruct (which accrues) from the usufruct for him
See the entire entry for pēr, pērā n.m. fruit