Noun
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a principal pipe in a system that distributes water or gas or electricity or that collects sewage
-
any very large body of (salt) water
Adjective
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of force
of the greatest possible intensity
"by main strength"
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(of a clause) capable of standing syntactically alone as a complete sentence
"the main (or independent) clause in a complex sentence has at least a subject and a verb"
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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"
"the master bedroom"
"a master switch"