Parenthetic \Par`en*thet"ic\, Parenthetical \Par`en*thet"ic*al\, a. [Cf. Gr. ?.]

1. Of the nature of a parenthesis; pertaining to, or expressed in, or as in, a parenthesis; as, a parenthetical clause; a parenthetic remark.

A parenthetical observation of Moses himself. --Hales.

2. Using or containing parentheses.

Source: Webster's Revised Unabridged Dictionary (1913)