Definition of pyrotechnically in English:
pyrotechnically
adverb ˌpʌɪrə(ʊ)ˈtɛknɪkli
With regard to pyrotechny; by pyrotechnical means; in a pyrotechnical manner (chiefly figurative).
Origin
Early 19th century; earliest use found in The Times. From pyrotechnical + -ly.