"His name is Ferrars," said he, in a very audible whisper; "but pray do not tell it, for it’s a great secret."
They arrived in due time at the place of destination, and as soon as the string of carriages before them would allow, alighted, ascended the stairs, heard their names announced from one landing-place to another in an audible voice, and entered a room splendidly lit up, quite full of company, and insufferably hot.
There are no more uses of "audible" in the book.
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She spoke in a barely audible whisper.
It was so quiet, our breathing was the only thing audible in the room.