Help support Wordnik by adopting your favorite word!


from The American HeritageĀ® Dictionary of the English Language, 4th Edition

  • adj. Having or resembling a knob or knoblike protuberance.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • adj. Having an umbo

from the GNU version of the Collaborative International Dictionary of English

  • adj. Having a conical or rounded projection or protuberance, like a boss.

from The Century Dictionary and Cyclopedia

  • Having a boss or umbo, as a shield or disk of any sort.
  • In zoology: Formed into an umbo, a boss, or a knob; button-like; umbonal; umbonic.
  • Having an umbo, as a shell; bearing umbones of this or that kind; umbonated: as, both valves strongly umbonate.
  • In botany, bearing an umbo or boss in the center, as the pileus of many species of Agaricus.


New Latin umbonatus. See umbo. (Wiktionary)



Log in or sign up to get involved in the conversation. It's quick and easy.