Sentence:  Mrs. Shaefer never got around to joining the thousand or so people who paid Lee some $ 30000 for his <WSD>ozone</WSD> machines . 
Meaning of the word marked with <WSD> tags:  a colorless gas (O3) soluble in alkalis and cold water; a strong oxidizing agent; can be produced by electric discharge in oxygen or by the action of ultraviolet radiation on oxygen in the stratosphere (where it acts as a screen for ultraviolet radiation)