The Latin roots of orotund are related to two more common English words—oral and rotund. Latin or- means "mouth," and rotundus means "round" or "circular." The Roman poet Horace joined forms of those Latin terms to create the phrase ore rotundo, literally meaning "with round mouth," and figuratively meaning "with well-turned speech." Ore rotundo was modified to orotund and adopted into English in the late 18th century. It can indicate either strength of delivery or inflated wording.
the tenor's orotund voice was just what this soaring aria needs a master of the orotund prose that is favored by academic journals of literary criticism
Recent Examples on the WebNovoselov had a boisterous, orotund way of talking that even the interpreter seemed to have trouble making sense of. Margaret Talbot, The New Yorker, 11 Aug. 2021 The speaker’s orotund oratory, his mannered put-downs, his mock pretentiousness, his pompous, practiced, often hilarious jawing will be no more. Karla Adam, Washington Post, 31 Oct. 2019
Word History
Etymology
modification of Latin ore rotundo, literally, with round mouth