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f wave, ff waves
atrial fibrillation wave.
F waveCardiology An atrial flutter wave on EKG, which appears as a 'sawtooth' pattern in leads II, III and aVF; less commonly, F waves are undulating, firing at a rate of 280-320/min, a rate often associated with a 2:1 block and alternating F waves merge with QRS or T waves Neurology
F response An undulation of an EMG that corresponds to the time between application of a stimulus to the axon of the α motor neuron as it propagates andromically to the anterior horn of the spinal cord, and then returns orthodromically along the same axon. See Electromyography.