equator

noun ! Definition from Wiktionary (CC BY-SA). Pronunciation from Wiktionary, via Kaikki.org. More about equator at Wordnik → Where our words come from →

1. An imaginary great circle around Earth, equidistant from the two poles, and dividing earth's surface into the northern and southern hemispheres.
2. A similar great circle on any sphere, especially on a celestial body, or on another reasonably symmetrical three-dimensional body.
3. The midline of any generally spherical object, such as a fruit or vegetable, that has identifiable poles.

   Slice the onion through the equator.