small river in N Italy that formed the boundary between Cisalpine Gaul & the Roman
Republic: when Caesar crossed
it (49 b.c.
) at the head of his army to march on Rome, he began
the civil war with Pompey
Webster’s New World College Dictionary, 4th Edition. Copyright © 2010 by
Houghton Mifflin Harcourt. All rights reserved.
Word origin of 'Rubicon'L Rubico (gen. Rubiconis)