| 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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| umbellar | (adjective) bearing or consisting of or resembling umbels | Synonyms: umbellate |
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| umbellate | (adjective) bearing or consisting of or resembling umbels | Synonyms: umbellar |
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| (adjective) resembling an umbel in form | Synonyms: umbel-like |
| umbellifer | (noun) any of numerous aromatic herbs of the family Umbelliferae | Synonyms: umbelliferous plant |
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| umbelliferous | (adjective) relating to or belonging to plants of the family Umbelliferae | - |
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| umbelliform | (adjective) resembling or in the form of an umbel | - |
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| umber | (adjective) of the color of any of various natural brown earth pigments | - |
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| (noun) a medium brown to dark-brown color | Synonyms: burnt umber, chocolate, coffee, deep brown |
| (noun) an earth pigment | - |
| umbilical | (adjective) relating to or resembling the umbilicus | - |
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| (noun) membranous duct connecting the fetus with the placenta | Synonyms: umbilical cord |
| umbilicate | (adjective) depressed like a navel | - |
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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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| umbrageous | (adjective) angered at something unjust or wrong | Synonyms: incensed, indignant, outraged |
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| (adjective) filled with shade | Synonyms: shadowed, shadowy, shady |
| umbrella | (adjective) covering or applying simultaneously to a number of similar items or elements or groups | - |
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| (noun) a formation of military planes maintained over ground operations or targets | - |
| (noun) having the function of uniting a group of similar things | - |
| (noun) a lightweight handheld collapsible canopy | - |
| umbrellalike | (adjective) resembling an umbrella | - |
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| 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 |
| (verb) be a referee or umpire in a sports competition | Synonyms: referee |
| umpteen | (adjective) innumerable but many | Synonyms: umteen |
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| umpteenth | (adjective) last in an indefinitely numerous series | Synonyms: umptieth, umteenth |
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| umptieth | (adjective) last in an indefinitely numerous series | Synonyms: umpteenth, umteenth |
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| umteen | (adjective) innumerable but many | Synonyms: umpteen |
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| umteenth | (adjective) last in an indefinitely numerous series | Synonyms: umpteenth, umptieth |
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