This word is acceptable for play in the UK dictionary that is being used in the following games:

• Lexulous
• Wordscraper
• Wordosaur

adj. Of or pertaining to retinoic acid or its derivatives

"Magor's team said the duck's virus detector gene, called the retinoic acid inducible gene enables a duck's immune system to contain the virus, which typically spreads from ducks to chickens where it mutates and can evolve to be a human threat such as the H5N1 influenza virus."