10-letter words containing u, m, b, r
- umber moth — any of various brownish geometrid moths, esp the waved umber (Menophra abruptaria) and small waved umber (Horisme vitalbata), that are cryptically marked to merge with tree bark, and the mottled umber (Erannis defoliaria) whose looper larvae can strip branches and even trees
- umberto ii — 1904–83, the last king of Italy (1946), following the abdication of his father Victor Emmanuel III: abdicated when a referendum supported the abolition of the monarchy
- umbiliform — having the form of an umbilicus.
- umbraculum — any of a genus of limpets belonging to the family Umbraculidae
- umbrageous — creating or providing shade; shady: an umbrageous tree.
- uncumbered — to hinder; hamper.
- unfarmable — a tract of land, usually with a house, barn, silo, etc., on which crops and often livestock are raised for livelihood.
- unnumbered — having no number or numbers as identification: unnumbered pages.
- unscramble — to bring out of a scrambled condition; reduce to order or intelligibility.
- untimbered — (of land) not timbered or wooded; not covered in forest
- urban myth — a modern story of obscure origin and with little or no supporting evidence that spreads spontaneously in varying forms and often has elements of humor, moralizing, or horror: Are there alligators living in the New York City sewer system, or is that just an urban legend?
- vat number — registration code for tax purposes
- vibraculum — any of the modified polyps on the surface of certain bryozoan colonies, having a long, whiplike appendage that clears away debris.
- wavenumber — (mathematics, physics) A measure of the number of waves in unit distance; inversely proportional to its wavelength.