Sentence:  Yet if he were not there , they would have missed him , as they would have missed the sounds of bees buzzing against the screen door in early June ; or the <WSD>smell</WSD> of thick tomato paste - the ripe smell that was both sweet and sour - rising up from aluminum trays wrapped in fly dotted cheesecloth . 
Meaning of the word marked with <WSD> tags:  the sensation that results when olfactory receptors in the nose are stimulated by particular chemicals in gaseous form