Sentence:  Between the telephone and the wall plug there was sixty <WSD>feet</WSD> of cord , and when the conversation came to an end , Eugene carried the instrument with him the whole length of the apartment , to his bathroom , where it rang three more times while he was shaving and in the tub . 
Meaning of the word marked with <WSD> tags:  a linear unit of length equal to 12 inches or a third of a yard