Velocimeter n. : An apparatus for measuring speed, as of machinery or vessels, but especially of projectiles.

Example:
How can I get more speed out of my '05 5.4 ford f150?

Taxonomy
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Defination from the web:
velocimeter in the Online Dictionary. Meaning of velocimeter. Pronunciation of velocimeter. Translations of velocimeter. ... Developed by the US Army Corps of Engineers, a velocimeter transmits a pulse of sound through water and measures its echo for changes in either ...