Chaliapin, Feodor Ivanovich, shah LYAH pihn, FYAW dor ih VAH nuh vihch (1873-1938), a Russian opera singer, became a leading interpreter of bass roles in Russian, French, and Italian opera. Many believe that Chaliapin's characterizations of Boris Godunov and Mephistopheles have never been equaled. He was a singing actor of striking originality and unique force.