Pronunciation: [nˈɪɡɹə] (IPA) 
The spelling of the word "nigra" is often a topic of debate. Many argue that it should be spelled with an "e" at the end, as in "negro," to avoid any potential offense. However, the spelling "nigra" was historically used in scientific literature to denote the color black. This spelling is based on the Latin word "niger," which means black. In IPA phonetic transcription, "nigra" is pronounced as /ˈniːɡrə/.
The word nigra does not have an etymology as it doesn't exist in any language. It is possible that you meant a variant of another word. However, if you were referring to nigra as a potential derivative of the Latin word niger, I can provide the etymology for that.
The Latin word niger means black or dark. Its etymology is uncertain, but it is believed to be of Indo-European origin. Niger is related to various other European languages, such as Old English neah, Old High German nah, and Sanskrit nagah, all of which mean black.
