1. A river in Italy, the crossing of which by Caesar, on a certain occasion, amounted to a declaration of war against the Republic. To cross the Rubicon, to take an irrevocable step.

Nuttall's Standard dictionary of the English language By Nuttall, P.Austin

• ribion,
• rubic,
• rubican,
• rubics,
• rubivan,
• rubicin,
• rubicom,
• rubicomn,
• rubion,
• rubiconn,
• rubicun,
• rubacin,
• Rubiacyn,
• Rubiacan,
• Rubacan,
• rubidin,
• rummicin,
• rubicorn,
• tubicron,
• rufinoo

• rubicund.

The adjective form of the word "rubicon" is "Rubiconian".

The plural of the "rubicon" can be the "rubicons".

The singular of the "rubicon" can be the "rubicon".