PERIAPSIS
periapsis, point of periapsis
(noun) (astronomy) the point in an orbit closest to the body being orbited
Source: WordNet® 3.1
Etymology
Noun
periapsis (plural periapsides)
(astronomy) The point of a body's elliptical orbit about the system's centre of mass where the distance between the body and the centre of mass is at its minimum.
Usage notes
In the case of some particular celestial bodies, specialised terms are used.
Synonyms
• pericenter
Antonyms
• apoapsis
Source: Wiktionary
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WHOLE
(noun) an assemblage of parts that is regarded as a single entity; “how big is that part compared to the whole?”; “the team is a unit”
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