[1]orotund:

     The Latin roots of orotund are related to two more common English
     words-[2]oral and [3]rotund. Latin or- means "mouth," and rotundus
     means "round" or "circular." The Roman poet [4]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.

   (Via [5]Merriam-Webster's Word of the Day)
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   My original entry is here: [7]TIL: orotund. It posted Sat, 29 Sep 2018
   07:59:53 +0000.
   Filed under: culture,

References

   1. https://www.merriam-webster.com/word-of-the-day/orotund-2018-09-27
   2. https://www.merriam-webster.com/dictionary/oral
   3. https://www.merriam-webster.com/dictionary/rotund
   4. https://www.merriam-webster.com/dictionary/Horace
   5. https://www.merriam-webster.com/word-of-the-day
   6. https://twitter.com/prjorgensen/status/1045947106664611841
   7. https://www.prjorgensen.com/?p=2082