Compound of ᠠᠶᠠᠨ (ayan, “wax”) + ᡩᡝᠩᠵᠠᠨ (dengjan, “lamp”), literally “wax lamp”.
ᠠᠶᠠᠨᡩᡝᠩᠵᠠᠨ • (ayan dengjan)