_:Bf979074d3cfc5c2964b3e58a1663dd21 . _:Bf979074d3cfc5c2964b3e58a1663dd21 "*sero‑" . "PIt" . "?" . _:Bf979074d3cfc5c2964b3e58a1663dd21 . "Etymology for: serum (la1500)" . "*sero‑ [n.]" . "*sero‑" . .