Tachymetry
Pronunciation : Ta*chym"e*try
Part of Speech : n.
Definition : Defn: The science or use of the tachymeter. -- Ta`chy*met"ric (#), a.
Source : Webster's Unabridged Dictionary, 1913
Merriam-Webster's Everyday Language Reference Set: Includes: The Merriam-Webster Dictionary, The Merriam-Webster Thesaurus, and The Merriam-Webster Vocabulary Builder