Le·on·i·das I 
(lē-ŏnĭ-dəs) Died 480 BC.
(lē-ŏnĭ-dəs) Died 480 BC. Spartan king (490-480) who led a small force against a huge Persian army at the pass of Thermopylae (480). All of the Spartans, including Leonidas, were killed.
- undercurrent
- undercut
- underdeveloped
- underdevelopment
- underdo
- underdog
- underdone
- underdrawers
- underdress
- underdrive
- undereducated
- underemphasis
- underemphasize
- underemployed
- underemployment
- underendowed
- underestimate
- underestimation
- underexpose
- underexposure
- underfeed
- under fire
- underflow
- underfoot
- underfund