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Crab

The English word “Crab” has 2 meanings listed here.

noun

  1. A unit for measuring the intensity of astrophysical X-ray sources, defined as the intensity of the Crab Nebula at the corresponding X-ray photon energy.

proper noun

  1. The constellation and zodiacal sign Cancer.
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Definitions are from Wiktionary, extracted by Kaikki.org, and are available under the CC BY-SA 4.0 licence.