Pachyonychia congenita

/pˌatʃɪənˈɪkiə kɒndʒɪnˈiːtə/

/pˌætʃɪənˈɪkiə kɑːndʒɪnˈiːɾə/

a rare genetic disorder that affects the nails and can cause thickened, abnormally shaped nails, as well as other skin and oral abnormalities