plumb line plumb level • plum blotch · · · Info · Definitions · Synonyms · Characters · · plumb line · · Text Common · · Latin · · Scripts 10 · · Length 2 · · Syllables Definitions · · · (noun) a cord from which a metal weight is suspended pointing directly to the earth's center of gravity; used to determine the vertical from a given point. Synonyms: plumb line, perpendicular. · · Noun Definition 1 Synonyms · · · perpendicular · · Synonym 1 Characters · · space U+0020 b latin small letter b U+0062 e latin small letter e U+0065 i latin small letter i U+0069 l latin small letter l U+006C m latin small letter m U+006D n latin small letter n U+006E p latin small letter p U+0070 u latin small letter u U+0075