PHONOCARDIOGRAPHY
\fˌɒnəkˌɑːdɪˈə͡ʊɡɹəfi], \fˌɒnəkˌɑːdɪˈəʊɡɹəfi], \f_ˌɒ_n_ə_k_ˌɑː_d_ɪ__ˈəʊ_ɡ_ɹ_ə_f_i]\
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Graphic registration of the heart sounds picked up as vibrations and transformed by a piezoelectric crystal microphone into a varying electrical output according to the stresses imposed by the sound waves. The electrical output is amplified by a stethograph amplifier and recorded by a device incorporated into the electrocardiograph or by a multichannel recording machine.
By DataStellar Co., Ltd
Word of the day
Snake's-head
- Guinea-hen flower; -- so called in England because its spotted petals resemble the scales of a snake's head.