back·stitch 
(băkstĭch′)
(băkstĭch′)n.
A stitch made by inserting the needle at the midpoint of a preceding stitch so that the stitches overlap by half lengths on the back of the fabric and appear continuous on the front.
backstitch′ v.
- prehensile
- prehensility
- prehension
- prehistorian
- prehistoric
- prehistorical
- prehistorically
- prehistory
- prehuman
- preignition
- preimage
- preindustrial
- preinstall
- preinstallation
- prejudge
- prejudgement
- prejudger
- prejudgment
- prejudice
- prejudicial
- prejudicially
- prejudicious
- prejudiciously
- prelacy
- prelapsarian