| umbel | (noun) flat-topped or rounded inflorescence characteristic of the family Umbelliferae in which the individual flower stalks arise from about the same point; youngest flowers are at the center | - |
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| umbellifer | (noun) any of numerous aromatic herbs of the family Umbelliferae | Synonyms: umbelliferous plant |
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| umber | (noun) a medium brown to dark-brown color | Synonyms: burnt umber, chocolate, coffee, deep brown |
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| (noun) an earth pigment | - |
| umbilical | (noun) membranous duct connecting the fetus with the placenta | Synonyms: umbilical cord |
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| umbilicus | (noun) a scar where the umbilical cord was attached | Synonyms: belly button, bellybutton, navel, omphalos, omphalus |
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| umbo | (noun) a slight rounded elevation where the malleus attaches to the eardrum | - |
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| umbra | (noun) a region of complete shadow resulting from total obstruction of light | - |
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| umbrage | (noun) a feeling of anger caused by being offended | Synonyms: offence, offense |
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| umbrella | (noun) a formation of military planes maintained over ground operations or targets | - |
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| (noun) having the function of uniting a group of similar things | - |
| (noun) a lightweight handheld collapsible canopy | - |
| umbrellawort | (noun) a plant of the genus Mirabilis | - |
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| umlaut | (noun) a diacritical mark (two dots) placed over a vowel to indicate a change in sound in some languages | - |
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| ump | (noun) an official at a baseball game | Synonyms: umpire |
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| umpirage | (noun) the act of umpiring | Synonyms: officiating, officiation, refereeing |
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| (noun) mediation by an umpire | - |
| umpire | (noun) an official at a baseball game | Synonyms: ump |
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| (noun) someone chosen to judge and decide a disputed issue | Synonyms: arbiter, arbitrator |