siedendem
Siedendem is a German form derived from the verb sieden, which means to boil or to simmer. It is the present participle adjective siedend inflected for the dative singular, used to describe a noun in the boiling state. In practice, you will see it in phrases that indicate liquid at or near boiling.
Grammatical notes: As an attributive adjective, siedend/ siedend has endings that depend on case, gender, number,
Etymology and usage: The word comes from the verb sieden plus the present-participle suffix -end. As a
Examples: im siedenden Wasser (in the boiling water), mit siedendem Wasser (with boiling water), das siedende
See also: sieden, Partizip I (present participle) in German grammar.