Parenthetical :: Parenthetical (a.) Of the nature of a parenthesis; pertaining to, or expressed in, or as in, a parenthesis; as, a parenthetical clause; a parenthetic remark..
Parenthetical :: Parenthetical (a.) Using or containing parentheses.
Parenthetically :: Parenthetically (adv.) In a parenthetical manner; by way of parenthesis; by parentheses.