inch
From LSJ
subs.
Use P. δάκτυλος, ὁ (about three-quarters of an inch). For larger measure, use P. and V. πῆχυς, ὁ (about eighteen inches) (Eur., Cycl.). Mark now whether you see me move a single inch: Ar. σκόπει νυν ἢν μʼ ὑποκινησαντʼ ἴδῃς (Ran. 644).