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.
from the GNU version of the Collaborative International Dictionary of English. n. A defense for the front of the thigh, consisting of one or more iron plates hanging from the belt on the lower edge of the corselet. from The Century Dictionary and Cyclopedia. n. In armor: A splint of steel of which several form the skirt, depending from the cuirass in the complete armor of the fifteenth century, before the introduction of the base.