出典:Wiktionary
Of geo- + cache. Suggested by participants in the mailing list gpsstash@egroups.com in May 2000, replacing the earlier gpsstash (see quotations below).
geocache (複数形 geocaches)
geocache (三人称単数 現在形 geocaches, 現在分詞 geocaching, 過去形および過去分詞形 geocached)