- the point in a lunar orbit that is nearest to the moon.
Origin of perilune
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
C20: from peri- + -lune, from Latin lūna moon
- The point at which an object orbiting the Moon, such as an artificial satellite, is closest to the Moon's center.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.