par·en·thet·i·cal 
(păr′ən-thĕtĭ-kəl)
(păr′ən-thĕtĭ-kəl)adj. also par·en·thet·ic (-ĭk)
1. Set off within or as if within parentheses; qualifying or explanatory: a parenthetical remark.
2. Using or containing parentheses.
n.
A parenthetical word, phrase, or remark.
par′en·theti·cal·ly adv.