Used to indicate an azo dye with a quaternary ammonium group, frequently with the diazo component being safranine.
A moon of Saturn.
A two-faced person, a hypocrite.
The god of doorways, gates and transitions, and of beginnings and endings, having two faces looking in opposite directions.
Used to indicate things with two faces (such as animals with diprosopus) or aspects; or made of two different materials; or having a two-way action.