decemvir

noun pl. decemvirs -·virs or decemviri -·viri′ (-vi rī′)

1. a member of a council of ten magistrates in ancient Rome: in 451-450 this body drew up the first Roman code of laws
2. a member of any authoritative group of ten men

Etymology: L, sing. of decemviri < decem, ten + vir, a man: for IE base: see werewolf