hyperphonia

hy·per·pho·ni·a

(hī'pĕr-fō'nē-ă),
Excessive effort in voice production characterized by loudness and undue tension of the vocal muscles.
[hyper- + G. phōnē, sound, voice]

hyperphonia

(hī″pĕr-fō′nē-ă) [″ + phone, voice]
1. Stuttering or stammering due to irritability of the vocal cords.
2. Explosive speech exhibited by those who stammer.