Meaning of blowdown

blow•down

Pronunciation: (blō'doun"), [key]
— n.
  1. a procedure for measuring the compression within an engine to identify certain mechanical defects, such as worn piston rings.
  2. a tree or stand of timber that has been blown down by the wind.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.