An archaic or variant form of antiperistatic, meaning relating to opposition or contrary forces that strengthen rather than weaken something.
A longer, more formal adjectival variant of 'antiperistatic,' common in older English texts, particularly in 17th-18th century philosophical and rhetorical writing.
This word shows how older English loved adding extra syllables for formality—'antiperistatical' sounds like something Newton or Boyle would have written when discussing forces in nature.
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