from The American Heritage® Dictionary of the English Language, 4th Edition
- n. The study of the physical features of the moon.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. the scientific study of the Moon's geographic features; geography of the Moon
from the GNU version of the Collaborative International Dictionary of English
- n. The science that treats of the physical features of the moon; -- corresponding to physical geography in respect to the earth.
from The Century Dictionary and Cyclopedia
- n. The scientific study of the moon: chiefly used with reference to study of the moon's physical condition, and especially the form and disposition of the elevations and depressions by which its surface is characterized.
selen- + -o- + -graphy (Wiktionary)