de·cem·vir 
(dĭ-sĕmvər)
(dĭ-sĕmvər)n. pl. de·cem·virs or de·cem·vi·ri (-və-rī′)
1. One of a body of ten Roman magistrates, especially a member of one of two such bodies appointed in 451 and 450 BC to draw up a code of laws.
2. One of an authoritative body of ten.
[Middle English, from Latin, sing. of decemvirī, commission of ten men : decem, ten; see dek in the Appendix of Indo-European roots + virī, pl. of vir, man; see wī-ro- in the Appendix of Indo-European roots.]
de·cemvi·ral adj.
de·cemvi·rate (-vər-ĭt, -və-rāt′) n.