Loud and echoey, as if produced by a megaphone.(adjective)
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Use "megaphonic" in a sentence
"He outlawed the ownership of public address systems and other megaphonic devices by individuals."
""Telephone Thing" sounds simulataneously dirge-like and vivacious, "Edinburgh Man" is sweetly melodic and atmospheric, and Smith's vocals - sometimes megaphonic, sometimes distorted - are a treat."
"Walt Whitman got one year's big whiff of the West and it transformed him, made him vastly panoramic and megaphonic."