Usually means: Resource Description and Access Cataloging.
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We found 8 dictionaries that define the word rdac:

General (5 matching dictionaries)
  1. RdAc: Merriam-Webster
  2. RdAc: Infoplease Dictionary
  3. RDAC, rdac: Dictionary.com
  4. RDAC: Wikipedia, the Free Encyclopedia
  5. RdAc: Wiktionary

Computing (1 matching dictionary)
  1. RdAc: Encyclopedia

Miscellaneous (2 matching dictionaries)
  1. RDAC: Acronym Finder
  2. AbbreviationZ (No longer online)

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Definitions from Wiktionary (RdAc)

▸ noun:  Abbreviation of radioactinium. [(physics) The radioactive isotope of actinium, ²²⁷₈₉Ac, having a half-life of 21.7 years]


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