un ver solitaire

I had un ver solitaire? What was that? A solitary worm? A lonely worm. A worm that kept to itself; a moody worm. My kind of worm. An individualistic worm that had taken up residence in my intestines. A worm of character. The English term suddenly snapped into my head. "You mean ... I have a ... I gotta ... there's a para- a parasite ... a living thing ... in me?"

(Thanks to 31seel.)