Etymology
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ticker (n.)

1821, "something that ticks," agent noun from tick (v.); slang meaning "heart" first recorded 1930. Ticker tape (1891) is from ticker "telegraphic device for recording stock market quotations, etc." (1883).

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Definitions of ticker

ticker (n.)
the hollow muscular organ located behind the sternum and between the lungs; its rhythmic contractions move the blood through the body;
Synonyms: heart / pump
ticker (n.)
a small portable timepiece;
Synonyms: watch
ticker (n.)
a character printer that automatically prints stock quotations on ticker tape;
Synonyms: stock ticker
From wordnet.princeton.edu