"From new". You see it in biochem when there are multiple ways to synthesize something and one of them starts from raw(er) materials. e.g. triglycerides can be made from free fatty acids or can start all the way from glucose. The pathway that starts with glucose is called "de novo lipogenesis".
> Borrowed from Latin dē novō (adverb, literally “from the new”), from dē (“from”) + novō, ablative singular of novus (“new”).
> Anew, afresh, from the beginning; without consideration of previous instances, proceedings or determinations.