Relating to, affected with, or having the nature of a fistula; characterized by the presence of an abnormal passage or tube.
From Latin fistula + -ous (adjective suffix meaning 'full of'). This is the standard modern English adjective form describing fistula-related conditions.
A 'fistulous withers' is a devastating horse disease where an infection creates a network of interconnected fistula passages along the horse's back—it was so common in working horses that entire veterinary textbooks chapters focused on it.
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