Meg″a‐phone (?), n. [Mega- + Gr. φωνή voice.] A device to magnify sound, or direct it in a given direction in a greater volume, such as a very large funnel used as an ear trumpet or as a speaking trumpet.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.