Go to MSN Homeencarta®
Dictionary
Find
in
Dictionary
Thesaurus
Translations
ABCDEFGHIJKLMNOPQRSTUVWXYZ
Click to move up the list of words
tack (3)
tack (4)
tack on
tack welding
tackboard
tacket
tackety boots
tackle
tacksman
tacky (1)
tacky (2)
Tacloban
tacmahack
taco
Tacoma
taconite
tacrolimus
Click to move down the list of words
Also available:

World English Dictionary
Dictionnaire Français

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.
Advertisement
© 2009 Microsoft