resolidify
/ˌriːsəˈlɪdɪfʌɪ/verb
1 [with object] To make (something, especially a melted substance) solid again; to solidify (something) again.
2 [no object] Especially of a melted substance: to become solid again; to solidify again.
Origin
Early 19th century; earliest use found in George Scrope (1797–1876), geologist and political economist. From re- + solidify.