Definition of Halley's comet in English:

Halley's comet

Syllabification: Hal·ley's com·et
Pronunciation: /ˈhalēz, ˈhā-
 
/
  • A periodical comet with an orbital period of about 76 years, its reappearance in 1758–59 having been predicted by Edmond Halley. It was first recorded in 240 bc and last appeared, rather faintly, in 1985–86.

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Word of the day coloratura
Pronunciation: ˌkɒlərəˈtjʊərə
noun
elaborate ornamentation of a vocal melody