[gno.mon] n [L, fr. Gk gnomon interpreter, pointer on a sundial, fr. gignoskein] (1546) 1: an object that by the position or length of its shadow serves as an indicator esp. of the hour of the day: as a: the pin of a sundial b: a column or shaft erected perpendicular to the horizon
2: the remainder of a parallelogram after the removal of a similar parallelogram containing one of its corners