As an adjective thermonuclear
is of, or relating to the fusion of atomic nuclei at high temperatures.
As an adverb thermonuclearly is
in a thermonuclear manner.
Of, or relating to the fusion of atomic nuclei at high temperatures.
Of, or relating to the use of atomic weapons based on such fusion, especially as distinguished from those based on fission.
* The first thermonuclear reaction was in a star; it was brought about by heat, as the description implies. .
In a thermonuclear manner.