An alternative or archaic adjective form meaning lacking rhythm; characterized by irregularity or absence of regular pattern.
From Greek 'a-' + 'rhythmos' with suffix '-ical,' an older adjective formation similar to 'arrythmic' but now largely obsolete.
Medical terminology evolved over time, so older texts use 'arrythmical' where modern doctors would say 'arrythmic'—it's like comparing Victorian-era medical books to modern ones!
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