millimicron

Từ điển WordNet v3.1 - WordNet Dictionary

noun

a metric unit of length equal to one billionth of a meter
• Syn:
nanometer, nanometre, nm, micromillimeter, micromillimetre
• Hypernyms:
metric linear unit
• Part Holonyms:
micron, micrometer
• Part Meronyms:
angstrom, angstrom unit, A