canon
/ˈka-nən/
noun
a regulation or dogma decreed by a church council
a provision of canon law
the most solemn and unvarying part of the Mass including the consecration of the bread and wine
noun
a clergyman belonging to the chapter or the staff of a cathedral or collegiate church
canon regular
noun
a deep narrow valley with steep sides and often with a stream flowing through it
something resembling a canyon