14 letters · 23 points in Scrabble
adjective of or having an orbit with a fixed period of 24 hours (although the position in the orbit may not be fixed with respect to the earth)
originEtymology tree Pre-Greek der. Proto-Hellenic *gayader. Ancient Greek γαῖᾰ (gaîă)clip. Ancient Greek γῆ (gê) Ancient Greek -ο- (-o-) Ancient Greek γεω- (geō-)der. English geo- English synchronous English geosynchronous From geo- + synchronous.
Etymology from Wiktionary, CC BY-SA 3.0