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tion of sulphuric acid on fluorite, and is usually collected as a solution in water. It attacks all silicates, as glass or porcelain, is the agent employed in etching glass, and is preserved only in vessels of platinum, lead, caoutchouc, or gutta-percha.

; as, the so-called hypnogenic pressure points, pressure upon which is said to cause an attack of hypnotic sleep. De Watteville.

s on the surface of the body, pressure upon which is said both to produce and arrest an attack of hysteria. De Watteville.

One who exposes or destroys impositions or shams; one who attacks cherished beliefs; a radical.

Ill temper, anger; moroseness; crossness. -- Ill turn. (a) An unkind act. (b) A slight attack of illness. [Colloq. U.S.] -- Ill will, unkindness; enmity; malevolence.

liding in; an immisson or entrance of one thing into another; also, a sudden descent or attack. Akenside. They sit silent . . . waiting for an illapse of the spirit. Jeffrey.

Not to be stormed, or taken by assault; incapable of being subdued; able to resist attack; unconquerable; as, an impregnable fortress; impregnable virtue. The man's affection remains wholly unconcerned and impregnable. South. -- Im*preg"na*ble*ness, n. -- Im*preg"na*bly, adv.

To attack by words or arguments; to contradict; to assail; to call in question; to make insinuations against; to gainsay; to oppose. The truth hereof I will net rashly pugn, or overboldly affirm. Peacham.

Act of impugning; opposition; attack. [Obs.] A perpetual impugnation and self-conflict. Bp. Hall.

on (Med.), the period which elapses between exposure to the causes of a disease and the attack resulting from it; the time of development of the supposed germs or spores.

Attack; occurrence. [Obs.] Sins of daily incursion. South.

s means, but obliquely or consequentially; by remote means; as, an indirect accusation, attack, answer, or proposal. By what bypaths and indirect, crooked ways I met this crown. Shak.

faith in justification. Bp. Burnet. The discovery of gunpowder developed the science of attack and defense in a new instrumentality. J. H. Newman.

The act of leaping on; onset; attack. [Obs.] Dryden.

intentions; to enter with a view to conquest or plunder; to make an irruption into; to attack; as, the Romans invaded Great Britain. Such an enemy Is risen to invade us. Milton.

The incoming or first attack of anything hurtful or pernicious; as, the invasion of a disease.

aim or rail (against some person or thing); to utter censorious and bitter language; to attack with harsh criticism or reproach, either spoken or written; to use invectives; -- with against; as, to inveigh against character, conduct, manners, customs, morals, a law, an abuse. All men inveighed against him; all men, exc…

h surface, is a gray or white metal. It is easily oxidized (rusted) by moisture, and is attacked by many corrosive agents. Symbol Fe (Latin Ferrum). Atomic weight 55.9. Specific gravity, pure iron, 7.86; cast iron, 7.1. In magnetic properties, it is superior to all other substances.

To go out; to rush out; to sally forth; as, troops issued from the town, and attacked the besiegers.

A gear; a tackle. (b) pl.