noun
a keyboard instrument resembling an organ but with the notes produced by steam whistles, used chiefly on showboats and in circuses
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The calliope is a musical instrument that produces sound by sending steam through whistles.
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I heard a calliope playing at the circus last night.
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Let's go check out the calliope at the fair!
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Her voice was like a calliope, filling the room with its melodic tones.