de·cur·i·on 
(dĭ-kyrē-ən)
(dĭ-kyrē-ən)n.
1. An officer in command of ten men in the army of ancient Rome.
2. A member of a municipal senate in ancient Rome that ran local government.
[Latin decuriō, from decuria, group of ten men, administrative body of ten families, from *decu-viria : decem, ten; see dek in the Appendix of Indo-European roots + vir, man; see wī-ro- in the Appendix of Indo-European roots.]
- semi-independent
- semi-infinite
- semiliquid
- semiliquidity
- semiliteracy
- semiliterate
- Semillon
- semilog
- semilogarithmic
- semilunar
- semilunar bone
- semilunar cartilage
- semilunar valve
- semilunate
- semimembranous
- semimonthly
- seminal
- seminal duct
- seminal fluid
- seminally
- seminal vesicle
- seminar
- seminarian
- seminarist
- seminary