dai·my·o or dai·mi·o 
(dīmē-ō′, dīmyō′)
(dīmē-ō′, dīmyō′)n. pl. daimyo or dai·my·os also daimio or dai·mi·os
A feudal lord of Japan who was a large landowner.
[Japanese daimyō : dai, great, big; see DAIKON + myō, name (from Early Middle Chinese mjiajng; akin to Tibetan ming, name and Burmese mañ, to be named).]