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tachograph
tachometer
tachy-
tachyarrhythmia
tachycardia
tachygraphy
tachylite
tachymetry
tachyon
tachypnea
tachypnoea
tacit
tacit collusion
taciturn
tack (1)
tack (2)
tack (3)
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tachyon
tach·y·on [ tákee òn ] (plural tach·y·ons)


noun 
Definition:
 
hypothetical subatomic particle: a hypothetical elementary particle that always travels faster than the speed of light
Encarta® World English Dictionary [North American Edition] © & (P)2009 Microsoft Corporation. All rights reserved. Developed for Microsoft by Bloomsbury Publishing Plc.
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