micromillimetre micromillimeter • micromineralogical · · · Info · Definitions · Synonyms · Characters · · micromillimetre · · Text Latin · · Script 15 · · Length 5 · · Syllables Definitions · · · (noun) a metric unit of length equal to one billionth of a meter. Synonyms: nanometer, nanometre, nm, millimicron, micromillimeter. · · Noun Definition 1 Synonyms · · · nanometer · · Synonym 1 nanometre · · Synonym 2 nm · · Synonym 3 millimicron · · Synonym 4 micromillimeter · · Synonym 5 Characters · · c latin small letter c U+0063 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 o latin small letter o U+006F r latin small letter r U+0072 t latin small letter t U+0074