par ‧ en ‧ thet ‧ i ‧ cal /ˌpærənˈθetɪk ə l◂/ BrE AmE ( also par‧en‧thet‧ic /-ˈθetɪk◂/) adjective formal
said or written while you are talking or writing about something else in order to explain something or add information:
parenthetical references to his childhood
—parenthetically /-kli/ adverb