taximeter
Concise Oxford English Dictionary © 2008 Oxford University Press:
taximeter /ˈtaksɪmiːtə/
▶noun a device used in taxis that automatically records the distance travelled and the fare payable.
– origin C19: from Fr. taximètre, from taxe ‘tariff’, from taxer ‘to tax’ + -mètre ‘(instrument) measuring’.
'taximeter' also found in these Oxford entries:

