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  • Rubiaceous

    adjective 1. belonging to the Rubiaceae, the madder family of plants. adjective 1. of, relating to, or belonging to the Rubiaceae, a widely distributed family of trees, shrubs, and herbaceous plants that includes the coffee and cinchona trees, gardenia, madder, and bedstraws

  • Rubicon

    noun 1. a river in N Italy flowing E into the Adriatic. 15 miles (24 km) long: in crossing this ancient boundary between Cisalpine Gaul and Italy, to march against Pompey in 49 b.c., Julius Caesar made a major military commitment. Idioms 2. cross / pass the Rubicon, to take a decisive, irrevocable step: Our […]

  • Rubicund

    adjective 1. red or reddish; ruddy: a rubicund complexion. adjective 1. of a reddish colour; ruddy; rosy

  • Rubidium

    noun, Chemistry. 1. a silver-white, metallic, active element resembling potassium, used in photoelectric cells and radio vacuum tubes. Symbol: Rb; atomic weight: 85.47; atomic number: 37; specific gravity: 1.53 at 20°C. noun 1. a soft highly reactive radioactive element of the alkali metal group; the 16th most abundant element in the earth’s crust (310 parts […]

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