The Collaborative International Dictionary of English v.0.48:

Ticker \Tick"er\ (t[i^]k"[~e]r), n. [See Tick.]
   1. One who, or that which, ticks, or produces a ticking
      sound, as a watch or clock, a telegraphic sounder, etc.
      [1913 Webster]

   2. 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.]

   3. 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]

   4. The heart. [Colloq.]
      [PJC]

   Ticker tape Tape from or designed to be used in a stock
      ticker, usu. of paper and being narrow but long.

   Stock ticker, an electro-mechanical information receiving
      device connected by telegraphic wire to a stock exchange,
      and which prints out the latest transactions or news on
      stock exchanges, commonly found in the offices of stock
      brokers. By 1980 such devices were largely superseded by
      electronic stock quotation devices.
      [1913 Webster +PJC]

WordNet (r) 3.0 (2006):

ticker
    n 1: the hollow muscular organ located behind the sternum and
         between the lungs; its rhythmic contractions move the blood
         through the body; "he stood still, his heart thumping
         wildly" [syn: heart, pump, ticker]
    2: a small portable timepiece [syn: watch, ticker]
    3: a character printer that automatically prints stock
       quotations on ticker tape [syn: ticker, stock ticker]

Moby Thesaurus II by Grady Ward, 1.0:

112 Moby Thesaurus words for "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