_:B3452e59eeb27952f4123e8556a13a262 "*sér‑o‑" . "PIE" . . . "?" . _:B3452e59eeb27952f4123e8556a13a262 . "*sér‑o‑ [n.]" . "Etymology for: serum (la1500)" . "*sér‑o‑" . .