A microsecond is a millionth (1*10^-6) of a second. It is often used for measuring things like atomic and chemical reactions, which occur in normally immeasurable amounts of time.
... back) (t, th, d, dh, n)
Dental (tongue against teeth, like Spanish) (t, th, d, dh, n)
Labial (with the lips[?]) (p, ph, b, bh, m)
It also has four semivowels: ...