N,N,N′,N′-tetramethyl-p-phenylenediamine, an easily oxidized phenylenediamine whose radical cation is a characteristic blue-violet colour.

The act, under the feudal system, of putting someone into possession of a fee or fief; enfeoffment.

In a passive-aggressive manner.

The capacity of a material to decompose over time as a result of biological activity, especially to be broken down by microorganisms.