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Noun: Rb
  1. A soft silvery metallic element of the alkali metal group; burns in air and reacts violently in water; occurs in carnallite and lepidolite and pollucite
    - rubidium, atomic number 37
Noun: R&B
  1. A combination of blues and jazz that was developed in the United States by Black musicians; an important precursor of rock 'n' roll
    "Ray Charles was a pioneer of R&B";
    - rhythm and blues, R and B, R'n'B [non-standard]

Type of: African-American music, black music, metal, metallic element, popular music, popular music genre

Part of: carnallite, lepidolite, pollucite

Encyclopedia: Rb

R&B