equator

Từ điển WordNet v3.1 - WordNet Dictionary

noun

1. an imaginary line around the Earth forming the great circle that is equidistant from the north and south poles (Freq. 1)
- the equator is the boundary between the northern and southern hemispheres
• Derivationally related forms:
equatorial
• Hypernyms:
great circle
2. a circle dividing a sphere or other surface into two usually equal and symmetrical parts
• Derivationally related forms:
equatorial, equate
• Hypernyms:
circle