Lewis Short
pressĭo (noun F) : premo.
* Lit., a pressing, pressing down, pressure (only in Vitruvius): pressio cacuminis,Vitr. 10, 8.
* Transf., the prop or fulcrum under a lever while the burden is raised, Caes. B. C. 2, 9, 6: pressio, quod Graeci ὑπομόχλιον appellant, Vitr. 10, 8.
Charlton T. Lewis, Charles Short, A Latin Dictionary