[noun] any very large body of (salt) water Synonyms: briny
[noun] a principal pipe in a system that distributes water or gas or electricity or that collects sewage
[adjective] 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" Synonyms: chief, primary, principal
[adjective] 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" Synonyms: independent
[adjective] of force; of the greatest possible intensity; "by main strength"