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T1H4E1R1M3O1N1U1C3L1E1A1R1
20 points

THERMONUCLEAR is validvalid

[adj]

185,778 of 196,601 in NWL2023·also valid in CSW24

of, relating to, or employing transformations in the nuclei of atoms of low atomic weight (as hydrogen) that require a very high temperature for their inception (as in the hydrogen bomb or in the sun) [adj]

248,786 of 280,887 in CSW24·also valid in NWL2023