The word "plegaphonia" is not a commonly known word, and as such, its spelling may be confusing at first glance. However, when broken down, the spelling becomes clearer. Using the International Phonetic Alphabet (IPA), the word can be transcribed as /plɛgə'foʊniə/, with an emphasis on the second syllable. The "plega" portion of the word likely comes from the Greek word meaning "strike" or "hit," while "phonia" is derived from the Greek word for "sound." Thus, "plegaphonia" may be understood to mean a striking or hit sound.
Tapping on the larynx or trachea, to take the place of the voice sounds in auscultation.
A practical medical dictionary. By Stedman, Thomas Lathrop. Published 1920.