微米

wēimǐ
micron (one thousandth of a millimeter or 10^-6 meter)

CEDICT

micrometer/micrometre (SI unit)

Wiktionary

Entry Composition

1 微 wēi
  1. tiny
  2. miniature
  3. slightly
  4. profound
  5. abtruse
  6. to decline
  7. one millionth part of
  8. micro-
  9. Taiwan pr. wéi
2 米 mǐ
  1. uncooked rice
  2. meter (unit of length)
  3. (slang) Chinese yuan