noun, plural um·bo·nes [uhm-boh-neez] /ʌmˈboʊ niz/, um·bos.
Origin of umbo
Examples from the Web for umbo
I have applied this term to the oblique descent made by the umbo, towards the basal extremity of the anterior side of bivalves.Zoological Illustrations, Volume III|William Swainson
The cuticle is smoky olive to fuliginous, darker when young, becoming paler as the pileus expands, but always darker on the umbo.Studies of American Fungi. Mushrooms, Edible, Poisonous, etc.|George Francis Atkinson
The umbo projects a little over the scutal margin of the terga.
Carina much bent, with the umbo placed at barely one third of the entire length of the valve from the apex.
The umbo here is invariably dorsal, the seed-wing invariably articulate.The Genus Pinus|George Russell Shaw
British Dictionary definitions for umbo
noun plural umbones (ʌmˈbəʊniːz) or umbos
Word Origin for umbo
Word Origin and History for umbo
1921, from Latin umbo "shield-boss, knob, projection."