An archaic or formal form of dynamitic; relating to dynamite and its properties.
From dynamite + -ical (variant adjective suffix). This form was more common in 19th-century technical writing but has largely been replaced by the simpler -ic form.
Words ending in -ical versus -ic tell a story about language evolution: '-ical' was preferred in formal Victorian-era scientific writing, but '-ic' eventually won out because it's shorter and easier to pronounce.
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