| raphania |
poisoning of humans or livestock by seeds of the wild radish, Raphanus raphanistrum.
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| Raphanus |
the radishes, a genus of plants of the family Cruciferae native to Europe and Asia. R. raphanis´trum is the wild radish, whose seeds contain a mustard oil glycoside and are poisonous to humans and livestock (see raphania). R. sati´vus is cultivated for food.
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| raphes |
genitive singular of raphe.
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| rapid eye m. |
the rapid conjugate movement of the eyes that occurs during REM sleep (see under sleep).
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| rapid eye movement s. |
the period of sleep during which the brain waves are fast and of low voltage, and autonomic activities, such as heart rate and respiration, are irregular. This type of sleep is associated with dreaming, mild involuntary muscle jerks, and rapid eye movements (REM). It usually occurs three to four times each night at intervals of 80 to 120 minutes, each occurrence lasting from 5 minutes to more than an hour. In adults, about 20 per cent of sleep is REM sleep and 80 per cent is NREM (non–rapid eye movement) sleep. Called also desynchronized s. and paradoxical s.. See also REM rebound, under rebound.
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