† parerˈgastical,a.Obs.rare. [f. parergon, after Gr. ἐργαστικ-ός working + -al1.] Of the nature of a parergon, done as by-work. 1597G. Harvey Trimming NasheWks. (Grosart) III. 15 But to leaue these parergasticall speeches and to come to your trimming, because I will deale roundly with you.