"Parenthetically" is a word in ENGLISH

A parenthetic flourish or flight of ornament in the course of a piece, commonly just before the final cadence.

Added or placed between the parts of another thing, as a clause inserted parenthetically in a sentence.

To ejaculate parenthetically.

Thrown in between other words or phrases; parenthetical; ejaculatory; as, an interjectional remark.

A parenthetical notice, usually of matter to be afterward expanded.

One of the curved lines () which inclose a parenthetic word or phrase.

To make a parenthesis of; to include within parenthetical marks.

Alt. of Parenthetical

Of the nature of a parenthesis; pertaining to, or expressed in, or as in, a parenthesis; as, a parenthetical clause; …

Using or containing parentheses.