Sentence:  He looked at her out of himself , she thought , as he did only for an instant at a time , the look which always surprised her even now when his uncombable hair was yellowing a little and his breath came hard through his nicotine choked <WSD>lungs</WSD> , the look of the gaunt youth she had suddenly found herself staring at in the Tate Gallery on a Thursday once . 
Meaning of the word marked with <WSD> tags:  either of two saclike respiratory organs in the chest of vertebrates; serves to remove carbon dioxide and provide oxygen to the blood