10 letters · 14 points in Scrabble
noun the branch of astronomy that deals with the moon
originEtymology tree English selen- Ancient Greek -ο- (-o-)der. Latin -o-bor. English -o- Ancient Greek -λογῐ́ᾱ (-logĭ́ā)bor. Latin -logialbor. French -logiebor. English -logy English selenology From selen- (“moon”) + -o- + -logy (“study”).
Etymology from Wiktionary, CC BY-SA 3.0