lock nut lock in • lock out · · · Info · Definitions · Synonyms · Characters · · lock nut · · Text Common · · Latin · · Scripts 8 · · Length 2 · · Syllables Definitions · · · (noun) supplementary nut that is screwed down on a primary nut to prevent it from loosening. Synonyms: locknut, safety nut. · · Noun Definition 1 Synonyms · · · locknut · · Synonym 1 safety nut · · Synonym 2 Characters · · space U+0020 c latin small letter c U+0063 k latin small letter k U+006B l latin small letter l U+006C n latin small letter n U+006E o latin small letter o U+006F t latin small letter t U+0074 u latin small letter u U+0075