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tachyon

UK:^*^*UK and possibly other pronunciationsUK and possibly other pronunciations/ˈtækɪˌɒn/US:USA pronunciation: respellingUSA pronunciation: respelling(tak′ē on′)

tach•y•on (tak′ē on′),USA pronunciation n. [Physics.]

Physicsa hypothetical particle that travels faster than the speed of light.

tachy- + -on¹ 1967

Collins Concise English Dictionary © HarperCollins Publishers::

tachyon /ˈtækɪˌɒn/ n

a hypothetical elementary particle capable of travelling faster than the velocity of light

Etymology: 20th Century: from tachy- + -on

'tachyon' also found in these entries (note: many are not synonyms or translations):

tachy-

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tachyon