what is the origin of the word raat ?

[KazmaKurek]

What is the origin of the word Raat?
Etymology. Inherited from Sauraseni Prakrit 𑀭𑀢𑁆𑀢𑀺 (ratti), from Sanskrit रात्रि (rā́tri). Doublet of रात्रि (rātri), a tatsama.