lock-nuts lock-hair fern • lock-up option · · · Info · Definitions · Synonyms · Characters · · lock-nuts · · Text Common · · Latin · · Scripts 9 · · 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 · · - hyphen-minus U+002D 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 s latin small letter s U+0073 t latin small letter t U+0074 u latin small letter u U+0075