Relating to, affecting, or having the character or nature of a fistula.
From Latin fistula + -atous (a variant of -ous meaning 'full of'). This is an older or more formal medical adjective form.
This word is the longer cousin of 'fistulous'—medical dictionaries from the 1800s preferred the -atous ending for precision, though both mean essentially the same thing in modern English.
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