The word "adad" is a proper noun and is used to refer to the Mesopotamian storm god. The correct pronunciation of the word is [aːdad] which is pronounced with a long "a" sound followed by a doubled "d" sound. The IPA phonetic transcription of the word "adad" indicates that the first "a" sound is pronounced with an "ah" sound, and the "d" sound is pronounced with a hard "t" sound. This word has been spelled in various ways throughout history, including Hadad or Addu.
The word "adad" is derived from Akkadian, which is an ancient Semitic language spoken in Mesopotamia (present-day Iraq) during the 3rd to the 1st millennium BCE. In Akkadian, "adad" means "thunder" or "storm". It is associated with the weather god of the same name, who was worshiped by the ancient Mesopotamians.