mains mainprise • mainsail · · · Info · Definitions · Synonyms · Characters · · mains · · Text Latin · · Script 5 · · Length Definitions · · · (noun) any very large body of (salt) water. Synonyms: main, briny. · · Noun Definition 1 (noun) a principal pipe in a system that distributes water or gas or electricity or that collects sewage. Synonyms: main. · · Noun Definition 2 Synonyms · · · main · · Synonym 1 briny · · Synonym 2 Characters · · a latin small letter a U+0061 i latin small letter i U+0069 m latin small letter m U+006D n latin small letter n U+006E s latin small letter s U+0073