American Heritage Dictionary
(3)
Century Dictionary
(2)
GNU Webster's 1913
(1)
WordNet
(1)
Elsewhere on the web
I like Grey Goose with a twist of valium email umbo makes a lot of sense here.— East Side Boxing
British authorities are kowtowing and rubberstamping such behaviour through politically correct bureaucratic umbo jumbo.— Whale Oil Beef Hooked
The centre or umbo is darker colored; flesh dry, tough and white.— Among the Mushrooms A Guide For Beginners
The edges were obtuse, the caps fleshy, then corky, smooth, the upper ends not regular, oblique in the form of an umbo or little knob, the pellicles or outside layers thin and easily separated.— Among the Mushrooms A Guide For Beginners
Prepositional Phrases u mome_, above: kurum' u mome yarime_, hang it over the table; u bane_, behind; mel' an' u ban' ando_, the child is behind the man; ul' umbo(le)_, in the middle of; Veke ul' umbol' ando_, he is at Vee Conjunctions I. Copulative -u(ne)_, and, with; naga kitoval' u kene' ema_, I killed a black and white parrot Une is generally only used to connect two nouns, and is placed between the two.— The Mafulu Mountain People of British New Guinea

American Heritage Dictionary (1)
Century Dictionary (1)
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You can expect to see this word about once a year.
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