Chalk-like gray or white silicon, composed of fossilized remains of marine life, which is used for thermal insulation for steam piping, paint extenders, scouring powders, filters, etc. Also called Tripoli or Infusorial Earth.
Diazo
Photocopying method, which uses a coating of a diazo compound on the paper that makes it sensitive to ultraviolet light, so that when exposed to light, it decomposes.
Dibble
A pointed tool used to make holes in the soil for seeds, bulbs, or young plants.
Dictum
Judge's remark in a court ruling not in and of itself embodying the law, it merely illustrates or amplifies the ruling. Alternately, the ruling made by an Arbitrator.
Die
(1) Any of various tools for molding, stamping, cutting or shaping. (2) The stationary part of a machine for shaping or punching holes in sheet metal. (3) The mold, which holds the molten metal.
Die cast
The casting of molten metal in a die.
Dieback
A process caused by disease or pests. It is the death of the tips of branches and shoots. It will progress until the whole plant dies.
Dielectric
Non-conducting material that is an electrical insulator.
Diesel engine
Type of internal combustion engine that burns fuel oil with the ignition brought about by heat resulting from air compression rather than by an electric spark as it is in a gasoline engine.
Diesel hammer
Type of machine for driving pilings, which uses diesel combustion to raise the hammer.
