perscrutation
/ˌpəːskruːˈteɪʃn/rare
noun
A thorough inquiry or investigation; careful scrutiny or examination.
Origin
Late Middle English; earliest use found in Guy de Chauliac's Grande Chirurgie. From classical Latin perscrūtātiōn-, perscrūtātiō careful searching from perscrūtāt-, past participial stem of perscrūtārī + -iō.