Sentence:  I made a speaking trumpet of my hands and commenced to whoop “Ahoy!” and “Hello!” at the top of my lungs. ... The Colonel woke up, and, after asking what in brimstone was the matter, opened his <WSD>mouth</WSD> and roared “Hi!” and “Hello!” like the bull of Bashan. 
Meaning of the word marked with <WSD> tags:  The opening of a creature through which food is ingested.