An archaic or alternative form meaning relating to or affected by arthritis.
From 'arthritic' + the suffix '-al' (relating to). This older variant added the classical Latin '-al' ending, common in 16th-17th century medical English, though 'arthritic' is now the standard form.
Language naturally streamlines itself—'arthritical' was used centuries ago but English speakers dropped the extra '-al' because saying 'arthritic' is faster and just as clear, showing how words evolve through lazy efficiency.
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