-phonous

What the writer says on the subject of accent, as it may be marked on that uniphonous instrument the drum, illustrates what had been written on the subject a century ago, by Malcolm; […]

Source: wiktionary

Micrŏphōnus, a, um. (Μικρός, small; φωνή, the voice.) Med., Physiol. Having a slender weak voice: micropho′nous.

Source: wiktionary

Notwithstanding the increasing attempts of the clergy to exclude the people from participating in the services of the Church, the laity continued for a long time the practice of hypophonous chants, which consisted of responses to the intonation, the reading, and the prayere of the clergy, and of the so-called Acroteleutia, or responses to the psalms sung by the clergy.

Source: wiktionary