speed ‧ om ‧ e ‧ ter /spɪˈdɒmətə, spɪˈdɒmɪtə, spiː- $ -ˈdɑːmətər/ BrE AmE ( also speed‧o /ˈspiːdəʊ $ -doʊ/ informal ) noun [countable]
an instrument in a vehicle that shows how fast it is going
speed ‧ om ‧ e ‧ ter /spɪˈdɒmətə, spɪˈdɒmɪtə, spiː- $ -ˈdɑːmətər/ BrE AmE ( also speed‧o /ˈspiːdəʊ $ -doʊ/ informal ) noun [countable]
an instrument in a vehicle that shows how fast it is going
Longman Dictionary of Contemporary English. Longman - Словарь современного английского языка. 2012