From Pluralpedia, the collaborative plurality dictionary
adraneian (n., adj.)
Applies toheadmates

Adraneian headmates are those that once were part of a system but no longer are. This may be due to fading, fusion, or splitting into ecliptives. This term can also be used to describe Walk Outs, but is not meant to refer to temporary headmates such as active walk-ins/exobonds.