(UK) Initialism of Reporting of Injuries, Diseases and Dangerous Occurrences Regulations.

(chemistry) the univalent radical -N=C=O (tautomeric with cyanate), and any of its hydrocarbyl derivatives R-N=C=O

(genetics) A pattern of inheritance showing that phenotypic traits can be passed from generation to generation through genes, which can keep their ability to be expressed while not always appearing...

plural of bivalency