Dictionary
per•turb
Pronunciation: (pur-tûrb'), [key]—
v.t.
1. to disturb or disquiet greatly in mind; agitate.
2. to throw into great disorder; derange.
3. Astron.to cause perturbation in the orbit of (a celestial body).
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.