Is "Amen" originally Arabic word?

Bismillahir Rahmanir Rahim. Alhamdulillahi rabbil-'alamin. Was-Salatu was-Salam 'ala Sayyidina wa Azimina, Wa Habibi Qulubina wa Shafii Nufusina, Abul Qasim Muhammad. Wa 'ala Ahli Bayti tayyibina tahireen. ---------- It seems to me that "Amen" is originally not Arabic word. Meybe it was adopted into Arabic from Hebrew? So the question is, **Is "Amen" originally Arabic word?** Or, **was "Amen" originally Arabic word at the time of the Prophet Muhammad SAW?** Wikipedia says it is originally Hebrew word. I hope experts of Arabic language will respond to my inquiry.