Correct spelling for the English word "Nurstle" is [nˈɜːsə͡l], [nˈɜːsəl], [n_ˈɜː_s_əl] (IPA phonetic alphabet).
The word "Nurstle" is believed to have originated from Middle English, although its exact etymology is unclear. It is thought to be derived from an Old Norse term "gnœrra", which meant "to rumble" or "grumble". Over time, the word evolved into "nursle" and eventually into "nurstle". It is usually used to describe the sound of a contented cat purring, or any soft murmuring or snuggling sound.