megaphone
n.
1878, coined (perhaps by Thomas Edison, who invented it) from Greek megas "great" (see mega-) + phone "voice" (see fame, n.). Related: Megaphonic. In Greek, megalophonia meant "grandiloquence," megalophonos "loud-voiced."
〔李〕n.扩音器 [-phone=an instrument for better sound] ←mega-[GK] =large大；one million百万，兆
〔李〕n. 喇叭筒，喊话筒 [mega- =great] ←-phone [GK] =an instrument for better sound表示“助声器械”
〔蒋〕[mega大，’把声音扩大”的仪器] 扩音器，喇叭筒
〔蒋〕[mega大，扩大，phon声音] 扩音器，喇叭筒，喊话筒