Usually means: Central, protruding part of shell.
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We found 29 dictionaries that define the word umbo:

General (20 matching dictionaries)
  1. umbo: Merriam-Webster
  2. umbo: Oxford Learner's Dictionaries
  3. umbo: American Heritage Dictionary of the English Language
  4. umbo: Collins English Dictionary
  5. umbo: Vocabulary.com
  6. umbo: Wordnik
  7. umbo: Wiktionary
  8. umbo: Webster's New World College Dictionary, 4th Ed.
  9. umbo: Infoplease Dictionary
  10. umbo: Dictionary.com
  11. Umbo (bivalve), Umbo (disambiguation), Umbo (eye), Umbo (mycology), Umbo: Wikipedia, the Free Encyclopedia
  12. Umbo: Online Plain Text English Dictionary
  13. umbo: Webster's Revised Unabridged, 1913 Edition
  14. umbo: Rhymezone
  15. Umbo: AllWords.com Multi-Lingual Dictionary
  16. umbo: Webster's 1828 Dictionary
  17. umbo: FreeDictionary.org
  18. umbo: The Phrontistery - A Dictionary of Obscure Words
  19. umbo: Mnemonic Dictionary
  20. umbo: TheFreeDictionary.com

Computing (1 matching dictionary)
  1. umbo: Encyclopedia

Medicine (4 matching dictionaries)
  1. umbo: Merriam-Webster Medical Dictionary
  2. Dorland's Illustrated Medical Dictionary (No longer online)
  3. online medical dictionary (No longer online)
  4. umbo: Medical dictionary

Science (4 matching dictionaries)
  1. Botanical Terms (No longer online)
  2. umbo: Mussel Glossary
  3. Flora of New South Wales (No longer online)
  4. Fishkeeping glossary (No longer online)

(Note: See umbonal as well.)

Definitions from Wiktionary (umbo)

noun:  (historical) The boss of a shield, at or near the middle and usually projecting, sometimes in a sharp spike.
noun:  (biology) A boss, or rounded elevation, or a corresponding depression, in a palate, disk, or membrane.
noun:  (anatomy) An inward projection of the tympanic membrane of the ear.
noun:  (zoology) One of the lateral prominences just above the hinge of a bivalve shell.
noun:  (mycology) A bump or protrusion on the cap of a mushroom or toadstool.

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    umber,     sienna,     ochre,     sepia,     taupe, more...



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