A sterile stratum that lies above the stratum being investigated
The rock and subsoil that lies above a mineral deposit such as a coal seam.
To overload or overtax.
A membrane.
A wheelrim.
An edge around something, especially when circular.
A semicircular copydesk.
To form a rim on.
To roll around a rim.
To lick the anus of a partner as a sexual act.
To follow the contours, possibly creating a circuit.