The phrase is chemists' terminology for a rubber compound that cures and solidifies when it is exposed to room temperature and moisture. These silicones exhibit high adhesion, flexibility and resistance to moisture. If you need weather and moisture resistance, as well as a caulk that adheres well to aluminum, glass or porcelain surfaces, RTV silicone is a good choice. Although the product sounds exotic, it's not. You can get RTV silicone caulk at home centers, hardware stores and paint stores.
Moisture appears to have gotten under it.
Then let the floor dry out over the course of a heating season. When it dries out, it should return to a relatively flat position. However, you may notice discoloration, looseness and some cupping even after the floor has dried. Unless the damage is severe, replacing the damaged area should not be necessary. After loose sections are refastened and the area is sanded, the entire floor should be refinished to blend in the repair.