or totalisator (ˈtəʊtəlaɪˌzeɪtə), totalizer or totaliser (ˈtəʊtəˌlaɪzə)
noun
1.
a system of betting on horse races in which the aggregate stake, less an administration charge and tax, is paid out to winners in proportion to their stake
2.
the machine that records bets in this system and works out odds, pays out winnings, etc
3.
an apparatus for registering totals, as of a particular function or measurement
US and Canadian term (for senses 1, 2): pari-mutuel
totalizator in American English
(ˈtoʊtəlɪˌzeɪtər)
noun
any machine for computing and showing totals of measurements, etc.; esp., a machine used in parimutuel betting for registeringbets and, usually, computing the odds and payoffs while the bets are being placed