One who, or that which, ticks, or produces a ticking sound, as a watch or clock, a telegraphic sounder, etc. [1913 Webster]
A telegraphic receiving instrument that automatically prints off stock quotations (stock ticker), market report, or other news on a paper ribbon or “tape.” [Webster 1913 Suppl.]
an electronic instrument receiving information by transmision from a remote source and displaying it in readable fashion, not necessarily on paper tape (e.g. on a video display terminal or moving ribbon of electronically controlled lights). [PJC]
The heart. [PJC]

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OXFORD DICTIONARY

ticker, n. colloq.
1 the heart.
2 a watch.
3 US a tape machine.

Idiom

ticker-tape
1 a paper strip from a tape machine.
2 this or similar material thrown from windows etc. to greet a celebrity.

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THESAURUS

ticker

American Stock Exchange, Amex, Big Ben, TelAutography, Teletype, Teletype network, Teletyping, Wall Street, abdomen, anus, appendix, blind gut, board, bourse, bowels, brain, cecum, chronometer, clock, clock movement, clockworks, closed-circuit telegraphy, code, colon, commodity exchange, corn pit, curb, curb exchange, curb market, duodenum, duplex telegraphy, electricity, endocardium, entrails, exchange, exchange floor, facsimile telegraph, foregut, giblets, gizzard, guts, heart, hindgut, horologe, horologium, innards, inner mechanism, insides, internals, interrupter, intestine, inwards, jejunum, key, kidney, kishkes, large intestine, liver, liver and lights, lung, midgut, multiplex telegraphy, news ticker, outside market, over-the-counter market, perineum, pit, pump, pylorus, quadruplex telegraphy, quotation board, railroad telegraphy, receiver, rectum, sender, simplex telegraphy, single-current telegraphy, small intestine, sounder, spleen, stock exchange, stock market, stock ticker, stomach, submarine telegraphy, telegraphics, telegraphy, telephone market, teleprinter, teletypewriter, teletypewriting, telex, the Big Board, the Exchange, third market, ticker tape, timekeeper, timepiece, timer, transmitter, tripes, turnip, typotelegraph, typotelegraphy, vermiform appendix, viscera, vitals, watch, watchworks, wheat pit, wire service, works

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ROGET THESAURUS

ticker

Stock Market

N stock market, stock exchange, securities exchange, bourse, board, the big board, the New York Stock Exchange, the market, the open market, over-the-counter market, privately traded issues, commodities exchange, futures exchange, futures market, the pit, the floor, ticker, stock ticker, quotation, stock index, market index, the Dow Jones Index, the Dow Industrials, the transportation index, utilities, the utilities index, the New York Stock Exchange index, the Nikkei index, the Financial Times index, the FTI, the over-the-counter index, NASDAQ index, broker, stockbroker, jobber, stock dealer, odd-lot dealer, specialist, investor, speculator, operator, bull, buyer, bear, short seller, scalper, arbitrager, arbitrageur, stockholder, share-holder, stockholder of record, bond holder, coupon- clipper, investment, speculation.

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