Etymology
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TNT

1915, abbreviation of trinitrotoluene (1908), from trinitro- indicating three nitro- groups in place of three hydrogen atoms in a compound, + toluene.

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Definitions of TNT

tnt (n.)
explosive consisting of a yellow crystalline compound that is a flammable toxic derivative of toluene;
Synonyms: trinitrotoluene
From wordnet.princeton.edu