In the R&K standard, NREM sleep was divided into four stages, with slow-wave sleep comprising stages 3 and 4. In stage 3, delta waves made up less than 50% of the total wave patterns, while they made up more than 50% in stage 4. Furthermore, REM sleep was sometimes referred to as stage 5.
Freebase(0.00 / 0 votes)Rate this definition: Turret. In architecture, a turret is a small tower that projects vertically from the wall of a building such as a medieval castle. Turrets were used to provide a projecting defensive position allowing covering fire to the adjacent wall in the days of military fortification.
battlement. noun rampart, wall, defence, fence, fort, barricade, stronghold, barbican, bastion, embankment, parapet, fortification, bulwark, earthwork, breastwork, bartizan, crenellation Guns could also be seen behind the battlements of the fort itself. 1  Facebook.ll day long he was running towers up, taking towers down, adding a wing here, putting on a battlement there, looking to the walls, strengthening the defences, giving ornamental touches to the interior, making in all respects a superb castle of it.