ETYMOLOGY
from Latin quadrivium (place where four ways meet) + -ous
EXAMPLE
“…By means of small galleries directed from the cellars of houses in the vicinity of any square or quadrivious spot, which it is likely a body of troops might occupy as a position, it will be very easy to establish and to spring mines with considerable effect…”
From: Defensive Instructions for the People
By Francis Maceroni
Lexicophilia 