hyperphonia

Excessive effort in voice production characterized by loudness and undue tension of the vocal muscles. [hyper- + G. phone, sound, voice]

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hy·per·pho·nia (hi″pər-foґne-ə) [hyper- + phon- + -ia] a dysphonia with excessively energetic phonation, as in stuttering. Called also superenergetic phonation.