incisure
Concise Oxford English Dictionary © 2008 Oxford University Press:
incisure /ɪnˈsɪʒə/ (also incisura /ˌɪnsɪˈʒʊərə/)
▶noun (pl. incisures or incisurae /-riː/) Anatomy a deep indentation or notch in an edge or surface.
'incisure' also found in these Oxford entries:

