1.nounA device used to dampen the effects of such things as sound, light, or fluid. Specifically, a baffle is a surface which is placed inside an open area to inhibit direct motion from one part to another, without preventing motion altogether.
"Tanker trucks use baffles to keep the liquids inside from sloshing around."
2.nounAn architectural feature designed to confuse enemies or make them vulnerable.
3.noun(coal mining) A lever for operating the throttle valve of a winding engine.