Short for phonograph or relating to sound reproduction equipment; a prefix meaning sound.
From Greek phōnē meaning 'sound' or 'voice.' First used as a prefix in the 1870s with Edison's phonograph invention, then became a standalone term for audio equipment by the early 1900s.
The 'phono' input on old stereos was specifically designed for turntables because vinyl records produce much weaker signals than other sources - they need special amplification! The Greek root 'phono' appears in dozens of words from telephone to symphony.
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