Definition from Wiktionary, the free dictionary
shaftment (plural shaftments)
- A span; a measure of about six inches.
- A unit of length, 6 - 6½ inches or 2 palms, i.e. 15.24 cm, the width of the fist and outstretched thumb of a standard archer.
- The shaftment is the width of the palm and the outstretched thumb.