Sentence:  “Your clothes don't weigh more'n seven pounds. And seven from—hum—say one hundred an' twenty-three—one hundred an' sixteen is your stripped weight.” / But at the <WSD>penultimate</WSD> word, Mary cried out with sharp reproof: / “Why, Billy Roberts, people don't talk about such things.” 
Meaning of the word marked with <WSD> tags:  Next to last, second to last; immediately preceding the end of a sequence, list, etc.