| 释义 |
WordReference Random House Learner's Dictionary of American English © 2024ho•ri•zon /həˈraɪzən/USA pronunciation n. - Astronomy[countable] the line or circle that forms what seems to be the boundary between earth and sky.
- on the horizon, at the limit or range of knowledge, progress, or the like:A cure for that disease is now on the horizon.
- Usually, horizons. [plural] the scope or range of a person's interest:Her horizons expanded when she lived abroad for a year.
WordReference Random House Unabridged Dictionary of American English © 2024ho•ri•zon (hə rī′zən),USA pronunciation n. - Astronomythe line or circle that forms the apparent boundary between earth and sky.
- Astronomy
- the small circle of the celestial sphere whose plane is tangent to the earth at the position of a given observer, or the plane of such a circle (sensible horizon.)
- the great circle of the celestial sphere whose plane passes through the center of the earth and is parallel to the sensible horizon of a given position, or the plane of such a circle (celestial horizon.)
- the limit or range of perception, knowledge, or the like.
- Usually, horizons. the scope of a person's interest, education, understanding, etc.:His horizons were narrow.
- Geologya thin, distinctive stratum useful for stratigraphic correlation.
- Geology, Agricultureany of the series of distinctive layers found in a vertical cross section of any well-developed soil.
- Latin horizontem, accusative of horizōn
- Middle French
- Greek horízōn (kýklos) bounding (circle), equivalent. to horíz(ein) to bound, limit + -ōn present participle suffix (nominative singular); replacing Middle English orizonte
- Latin horizōn
- 1540–50
- 4.See corresponding entry in Unabridged world, perspective, domain, viewpoint.
Collins Concise English Dictionary © HarperCollins Publishers:: horizon /həˈraɪzən/ n - Also called: visible horizon, apparent horizon the apparent line that divides the earth and the sky
- Also called: sensible horizon the circular intersection with the celestial sphere of the plane tangential to the earth at the position of the observer
Also called: celestial horizon the great circle on the celestial sphere, the plane of which passes through the centre of the earth and is parallel to the sensible horizon- the range or limit of scope, interest, knowledge, etc
- a thin layer of rock within a stratum that has a distinct composition, esp of fossils, by which the stratum may be dated
Etymology: 14th Century: from Latin, from Greek horizōn kuklos limiting circle, from horizein to limit, from horos limit |