noun ·Rare ·Advanced level

Definitions

Noun

1. 1
   The science of studying and mapping the Moon's size, shape and surface topography, and its gravitational and magnetic fields. uncountable

Etymology

From Ancient Greek selene, Moon, + daiein, to divide, by analogy with geodesy.

Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.