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Related to blasting: Explosives, Sand blasting, Grit blasting


shattering, breaking, or splitting of rock or other material by the discharge of an explosiveexplosive,
substance that undergoes decomposition or combustion with great rapidity, evolving much heat and producing a large volume of gas. The reaction products fill a much greater volume than that occupied by the original material and exert an enormous pressure, which can be
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 placed within or in contact with it. It is a necessary part of many engineering operations. An ancient method of breaking rock consisted of heating the rock by fire and then pouring water on it, the sudden contraction resulting in shattering or cleavage. Modern methods of blasting involve four operations: drilling the holes to receive the charge, placing it, stemming the hole (i.e., filling the hole above the charge with earth or clay), and igniting or detonating the charge. The location, size, and number of holes drilled depend upon local conditions and the nature of the work. The holes vary from 1 to 3 in. (3–8 cm) in diameter and from a few inches up to 20 ft (6 m) or more in depth. The charge is made up of some explosive, such as dynamite or ammonium nitrate; black powder, the oldest known explosive, is rarely used today. Multiple charges are sometimes set off, either simultaneously or in sequence.


(religion, spiritualism, and occult)

A medieval term for the interference with the fertility of crops, humans, and animals, by witches. If a farmer suffered a poor harvest, he might well blame it on a witch for "blasting" his crops. If a woman miscarried, she might claim she had been blasted. It was said that the spell for blasting included the flaying of a cat, lizard, snake, or toad, then reducing the skin to ashes over a fire made of yew, hawthorn, and elder. The ashes were scattered over the farmer's fields or sprinkled on the threshold of his house.

In fact, true Witches are very pro-life and work for fertility, not against it. But this was part of the propaganda of the early Church, a reversal of true pagan ways to make them appear negative. In the Malleus Malleficarum (1486), the second of its three parts deals with a number of sexual matters (with which the inquisitors seemed especially fascinated), including the methods used by witches to dull the powers of generation and obstruct the sex act. It also deals with how they cause the male organ to disappear, how they kill a child in the womb, and how they injure cattle and raise storms.

The two monks who wrote the Malleus Malleficarum were quite specific when it came to descriptions of these acts: "Intrinsically they cause (obstruction of the procreant function) in two ways. First, when they directly prevent the erection of the member which is accommodated to fructification. And this need not seem impossible, when it is considered that they are able to vitiate the natural use of any member. Secondly, when they prevent the flow of the vital essences to the members in which resides the motive force, closing up the seminal ducts so that it does not reach the generative vessels, or so that it cannot be ejaculated, or is fruitlessly spilled."

But blasting could also be done with the evil eye, by the witch just looking at the person or thing and muttering a curse. Charges of blasting were frequently made against witches and, as with so many false charges, were almost impossible to disprove.


Cleaning materials by a blast of air that blows small abrasive particles against the surface.
The act of detonating an explosive.
Abrasion caused by movement of fine particles against a stationary fragment.


Using explosives to loosen rock or other closely packed materials.
References in periodicals archive ?
Most foundries use dry-ice blasting on coreboxes and permanent molds, as cleaning castings with the technology takes longer than traditional methods.
We have developed what I feel is the safest underground explosives storage and handling plan I've ever been around,'' said Gordon Revey, an MTA consultant on the blasting who works for Geotek & Associates Inc.
The blasting will use water-based emulsion explosives that Revey said are substantially more stable and safe than traditional nitroglycerin-based explosives.
Basically, the system divides the steel grit from the dirt which comes from the blasting.
In fact, another foundry recently switched to dry ice blasting from glass beads because "on our higher production molds, we've noticed a high degree of wear on the mold partings using glass beads.
Thus, the machine itself may receive more blasting than the actual part, causing premature wear on the machine and an increase in cycle time.
These deposits could not be blown out, making it necessary to revert back to sand blasting and the tedious knifing process.
Chippers are also used to remove core sand which failed to be removed at shakeout or in shot blasting.