Halley's comet


Definition: Meaning of, Halley's comet in English to English dictionary.

Pronunciation: / ˈkɒmɪt /

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  1. a COMET (= an object in space like a bright ball with a long tail) that moves around the Sun and passes close to the Earth every 76 years. It was named after the English ASTRONOMER Edmund Halley (1656-1742), and it last appeared close to the Earth in 1986.
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Pronunciation: ˈdʌb(ə)l rɪˈpleɪsm(ə)nt rɪˈakʃ(ə)n
Parts of Speech: noun
a chemical reaction between two compounds where the positive ion of one compound is exchanged with the positive ion of another compound