microsecond

[mahy-kruh-sek-uh nd] /ˈmaɪ krəˌsɛk ənd/
noun
1.
a unit of time equal to one millionth of a second. Symbol: μsec.
Origin
1905-10; micro- + second2
British Dictionary definitions for microseconds

microsecond

/ˈmaɪkrəʊˌsɛkənd/
noun
1.
one millionth of a second μs
Word Origin and History for microseconds

microsecond

n.

1906, from micro- + second (n.).

microseconds in Science
microsecond
  (mī'krō-sěk'ənd)   
A unit of time equal to one millionth (10-6) of a second.