Definition of Crab Nebula in English:

Crab Nebula

Syllabification: Crab Neb·u·la
Astronomy
An irregular patch of luminous gas in the constellation Taurus, believed to be the remnant of a supernova explosion seen by Chinese astronomers in 1054. At its center is the first pulsar to be observed visually, and the nebula is a strong source of high-energy radiation.

Definition of Crab Nebula in:

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Word of the day neoteny
Pronunciation: niːˈɒt(ə)ni
noun
retention of juvenile features in the adult animal