A device or software application used to make telephone calls, or a person who makes calls professionally.
From 'dial' (referring to the numbered disk on rotary phones) plus the agent suffix '-er'. The term evolved from mechanical rotary systems to include push-button and digital calling methods.
The word 'dialer' persists even though most modern phones don't have actual dials - we still 'dial' numbers on touchscreens. This linguistic fossilization shows how technology terms often outlive the physical objects that inspired them.
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