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auto-dialer

[aw-toh-dahy-uh-ler, -dahy-ler]
noun
  1. a telephone device that makes possible a service feature (au·to-dial) whereby a call is automatically made in response to a brief input signal from the user, as the pressing of a button.
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Also called automatic dialer.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018