A river in Germany, 524 km (329 miles) long, and one of the more significant tributaries of the Rhine.
The most important element.
Duct for conveying water to a given place.
most important element; "the chief aim of living"; "the main doors were of solid glass"; "the principal rivers of America"; "the principal example"; "policemen were primary targets"
(grammar) of a clause; able to stand alone syntactically as a complete sentence; "the main (or independent) clause in a complex sentence has at least a subject and a verb"
of force; of the greatest possible intensity; "by main strength"
a principal pipe in a system that distributes water or gas or electricity or that collects sewage
any very large body of (salt) water
(of a clause) capable of standing syntactically alone as a complete sentence
