Halley-s-comet definitions

hăl'ēz, hā'lēz
A comet with a period of approximately 76 years. The first comet for which a return to the inner solar system was accurately predicted, it last appeared in 1986.
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A famous comet, last seen in 1986, whose reappearance about every 76 years was predicted by Edmond Halley.
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A short-period comet that orbits the Sun once every 76 years. It is visible to the unaided eye and last appeared in 1986, when close observation by spacecraft showed that its nucleus measures about 16 km (10 mi) by 8 km (5 mi) and is composed of water ice, stony minerals, and organic compounds. Its next appearance will be in the year 2061.
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A very bright comet which can be seen from Earth every 75-76 years.
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Origin of halley-s-comet

(Circa 1758) Named for Edmond Halley, the English astronomer who first computed its orbit and established its periodicity (observations of individual passages date back at least to 240 B.C.). Halley predicted the return of the comet (then last seen in 1682) in 1705; when it did return in late 1758, it quickly acquired this name.