Definition of Halley's comet in English:

Halley's comet

Line breaks: Hal¦ley's comet
A periodical comet with an orbital period of about 76 years, its reappearance in 1758-9 having been predicted by Edmond Halley. It was first recorded in 240 bc and last appeared, rather faintly, in 1985-6.

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Word of the day flagitious
Pronunciation: fləˈdʒɪʃəs
adjective
(of a person or their actions) criminal; villainous