What does "fistmele" mean?

A traditional unit of distance equal to the width of a clenched fist with the thumb extended (approx. 6½ inches or 16½ centimetres).

What is a synonym for "fistmele"?

Common synonyms include: fist length, fist measure, handspan, span unit.

/ˈfɪstˌmiːl/ noun

noun ·Rare ·Advanced level

Noun

1
A traditional unit of distance equal to the width of a clenched fist with the thumb extended (approx. 6½ inches or 16½ centimetres).
2
about seven inches; the breadth of a fist with the thumb stuck out (used especially in archery to give the correct distance of the string from the bow) wordnet

From fist + mele, variant of meal (“measure”), from Old English mæl.