Sentence:  Under the name of " compound oxygen " or " <WSD>liquid oxygen</WSD>," it has been used in its liquid form by quacks, and has been sold as a patent medicine ; and has cured some who had experienced no relief from treatment ordinarily adopted for such cases. 
Meaning of the word marked with <WSD> tags:  A solution of hydrogen peroxide and other compounds that is reputed to have health benefits.