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nocturn
nocturnal
nocturne
nocuous
nod
nod off
nod out
nod through
nodal tachycardia
nodding donkey
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nodal tachycardia
nod·al tach·y·car·di·a


noun 
Definition:
 
periods of very fast pulse rate: a rapid heart rate of 140-220 beats per minute, occurring for periods ranging from seconds to days
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