Ictosyllabic metre: a metre in which each line has a fixed number of beats, and a fixed number of off-beats between each pair of beats within the line, either one (duple metre), two (triple metre) or three (quadruple or paeonic metre, q.v.). Examples:
Should you ask me, whence these stories?
Whence these le-gends and tra-ditions,
With the o-dors of the fo-rest
With the dew and damp of mea-dows