Hebdo-
Hebdo- is an obsolete decimal metric prefix equal to 107. It is derived from the Greek hebdοmos meaning seventh.
The definition of one hebdomometre or hebdometre as was originally proposed by Rudolf Clausius for use in an absolute electrodynamic system of units named the quadrant–eleventh-gram–second system, also known as the hebdometre–undecimogramme–second system in the 1880s. It was based on the meridional definition of the metre which established one ten-millionth of a quadrant, a quarter of an astronomical meridian or the distance from the north pole to the equator, as a metre.
