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.

Definition of Halley's comet in:

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Word of the day oleaginous
Pronunciation: ˌəʊlɪˈadʒɪnəs
rich in, covered with, or producing oil; oily