circle of willis circle of curvature • circler · · · Info · Definitions · Characters · · circle of willis · · Text Common · · Latin · · Scripts 16 · · Length 5 · · Syllables Definitions · · · (noun) a ring of arteries at the base of the brain. Synonyms: circle of Willis. · · Noun Definition 1 Characters · · space U+0020 c latin small letter c U+0063 e latin small letter e U+0065 f latin small letter f U+0066 i latin small letter i U+0069 l latin small letter l U+006C o latin small letter o U+006F r latin small letter r U+0072 s latin small letter s U+0073 w latin small letter w U+0077