dialer

[dahy-uh-ler, dahy-ler]
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noun

a person or thing that dials.
an electronic device attached to a telephone to call preselected numbers automatically when activated.

Also especially British, di·al·ler.

Origin of dialer

First recorded in 1740–50; dial + -er1
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

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Historical Examples of dialer