nigredo

From Latin nigrēdō (“blackness”).

nigredo (uncountable)

1. (alchemy) A process of putrefaction or decomposition, one of the four major stages of the alchemical magnum opus.

   Synonym: melanosis

   Coordinate terms: albedo, citrinitas, rubedo

2. (psychology) A term in Jungian psychology referring to mental negativity.

• Doering, Gironde, Negroid, eroding, groined, ignored, negroid, redoing

From niger +‎ -ēdō.

• (Classical) IPA^(key): /niˈɡreː.doː/, [nɪˈɡreːd̪oː] or IPA^(key): /niɡˈreː.doː/, [nɪɡˈreːd̪oː]
• (modern Italianate Ecclesiastical) IPA^(key): /niˈɡre.do/, [niˈɡrɛːd̪o] or IPA^(key): /niɡˈre.do/, [niɡˈrɛːd̪o]

nigrēdō f (genitive nigrēdinis); third declension

1. blackness

Third-declension noun.

• → English: nigredo

• “nigredo”, in Charlton T. Lewis and Charles Short (1879) A Latin Dictionary, Oxford: Clarendon Press
• nigredo in Gaffiot, Félix (1934) Dictionnaire illustré latin-français, Hachette.