A plate used to prevent the movement of gases or liquids in the direction that it would normally follow, and to direct it into the desired path.

A deflector, as a plate or wall, so arranged across a furnace or boiler flue as to mingle the hot gases and deflect them against the substance to be heated.

A grating or plate across a channel or pipe conveying water, gas, or the like, by which the flow is rendered more uniform in different parts of the cross section of the stream; -- used in measuring the rate of flow, as by means of a weir.

A device usually consisting of a plate or series of plates which evenly distribute airflow and dust within a dust collector to protect filter bags from direct impingement of dust.

The front surface of a loudspeaker, on which the drivers are mounted.

A flat panel that divides the front and rear sound waves produced by a woofer. Sometimes baffle is used to mean an enclosure or the front panel that the speaker is mounted on.

The front panel of a speaker enclosure which is used to hold the drivers.

Term relating to a sound system in which the speaker is mounted on a flat board, such as a rear parcel shelf. Also applies to a plate inside the muffler to break up flow of exhaust gases and reduce the noise.

A shield of metal, wood or plastic used to screen a light source from normal angles of viewing. Aluminum baffles are commonly used in parabolic fixtures such as Lithonia Paramax® and Optimax® fixtures.

Part of the fixture that blocks light to prevent glare and control brightness. Baffles may be integral blades, plates or grooves or an accessory. Baffles are often painted black to absorb light.

A device used to prevent stray light.

A single opaque or translucent element used to control light distribution at certain angles.

To check by shifts and turns; to elude; to foil.

To check by perplexing; to disconcert, frustrate, or defeat; to thwart.

A defeat by artifice, shifts, and turns; discomfiture.

hinder or prevent (the efforts, plans, or desires) of; "What ultimately frustrated every challenger was Ruth's amazing September surge"; "foil your opponent"

A narrow sheet of neoprene which is fitted in the recesses in the edge of adjacent panels where they join vertical to form an open drained joint. This form of joint is seldom used.

A vertical wall of fabric sewn between the top and bottom layers of a comforter shell, allowing the down comforter to expand to its highest loft.

Pieces a fabric sewn across each corner of a tubular or 4 - panel bag to improve the bag's 'squareness' or appearance.

A chamber sewn in an insulated garment or sleeping bag that keeps insulation from shifting and created cold spots. See loft.

a dome-shaped piece that can be attached to a hanging feeder, or cylinder-shaped piece to attach to a pole feeder

an obstructive device made of metal or heavy plastic that prevents the squirrel from reaching the feeder

An obstacle purposely placed around a bird feeder to keep out unwanted competitors and predators.

(n.) A device or devices designed to deter the retrieval of items through a depository opening. Source: Lock Industry Standards and Training (LIST) Council

Outlet -a component that slows or redirects flowing fluids in a septic tank to help prevent floating material (or scum) from entering the outlet pipe. Inlet -a component that slows or redirects flowing fluids in a septic tank to help prevent agitation of scum layer in the primary chamber.

A system of cold surfaces placed between the inlet of a pump and the area on which it is pumping to condense backstreaming vapor and return it to the pump.

Primarily used in vessels with agitators. Commonly used to increase the amount of agitation or mixing.

A built structure or planting that slightly obstructs the view into or out of an area.

A chamber used to obstruct the movement of a substance (for example, water).

obstructing member, esp. used to hold back or turn aside flow of gas or liquid.