Chvostek's sign

noun

Chvos·​tek's sign (ḵə-)ˌvȯs-ˌtek(s)- 

variants or Chvostek sign

(ḵə-)ˌvȯs-ˌtek- 

: a twitch of the facial muscles following gentle tapping over the facial nerve in front of the ear that indicates hyperirritability of the facial nerve