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| a period of sleep during which most dreaming occurs as the eyes move under closed lids and the skeletal muscles are deeply relaxed |
| the movement of an organism in response to a stimulus such as light |
synovia syn·o·vi·a (sĭ-nō'vē-ə)
n.
A clear, thixotropic lubricating fluid secreted by membranes in joint cavities, tendon sheaths, and bursae. Also called synovial fluid.