noun Pla·ci·do [plah-si-doh; Spanish plah-thee-th aw, -see-] /ˈplɑ sɪˌdoʊ; Spanish ˈplɑ θi ðɔ, -si-/, born 1941, Spanish operatic tenor, in the U.S. nounPlacido (ˈplaθiðo). born 1941, Spanish operatic tenor