Rb

noun, phrase, slang

noun, phrase, slang ·Moderate ·College level

Definitions

Noun
  1. 1
    Initialism of running back. abbreviation, alt-of, initialism
  2. 2
    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 wordnet
  3. 3
    Abbreviation of reblog. abbreviation, alt-of
Phrase
  1. 1
    Abbreviation of reply back. Internet, abbreviation, alt-of, informal

Synonyms

All synonyms
atomic number 37rubidiumrubidiumsilver

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Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.