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rubidium a highly reactive chemical element of the alkali metal group that has thirty-seven protons in each nucleus, that occurs naturally only in compounds with oxygen and other elements, but that can be isolated as a liquid or very soft solid metal. (symbol: Rb)
ruble the chief monetary unit of Russia and other countries of the former Soviet Union, equaling one hundred kopecks.
rubric a law, class, or category, or a title indicating it. [5 definitions]
rub the wrong way to irritate or annoy.
ruby a deep red gemstone, or something made of this stone. [4 definitions]
ruche a strip of pleated or gathered trim, as of lace or fine muslin, usu. used as a trimming for the neck or wrists of a dress.
ruching a ruche or ruches. [2 definitions]
rucksack a strong bag hung on the back from shoulder straps, used by hikers and mountain climbers; knapsack.
ruckus (informal) a noisy, often angry, disturbance; commotion or row.
ruction (informal) a noisy quarrel or other disturbance; ruckus.
rudder a movable vertical blade at the rear end of a ship or airplane, used to control direction. [2 definitions]
rudderless combined form of rudder.
rudderpost the vertical post on which a rudder pivots; rudderstock.
ruddy having a healthy-looking, rosy complexion. [2 definitions]
ruddy duck a North American duck, the male of which has a reddish brown neck and upper plumage, a black crown, and white cheeks.
rude unmannerly or impolite. [5 definitions]
rudiment (usu. pl.) a basic element, idea, skill, or the like in a complex subject or activity. [3 definitions]
rudimentary of or pertaining to the basic or first principles; elementary. [2 definitions]
rue1 to regret, repent of, or feel sorry about. [3 definitions]
rue2 a fragrant flowering plant found in Europe and Asia, the evergreen leaves of which yield an oil formerly used in medicines.
rueful inspiring sorrow or pity. [2 definitions]