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The modified condition of a nerve, when a constant current of electricity passes through any part of it. See Anelectrotonus, and Catelectrotonus.

Making a circuit of the year of the seasons; recurring in each quarter of the year; as, ember fasts.

A plug of some substance lodged in a blood vessel, being brought thither by the blood current. It consists most frequently of a clot of fibrin, a detached shred of a morbid growth, a globule of fat, or a microscopic organism.

Sudden or unexpected appearance; an unforeseen occurrence; a sudden occasion. Most our rarities have been found out by casual emergency. Glanvill.

An iron-black mineral of metallic luster, occurring in small orthorhombic crystals, also massive. It contains sulphur, arsenic, copper, and often silver.

Occurring once in every nine times, days, years, etc.; every ninth. Enneatical day, every ninth day of a disease. -- Enneatical year, every ninth year of a man's life.

To draw along as a current does; as, water entrained by steam.

gents. push the envelope. It is used to refer to the maximum performance available at the current state of the technology, and therefore refers to a class of machines in general, not a specific machine. push the envelope Increase the capability of some type of machine or system; -- usu. by technological development.…

A mineral, commonly of a yellowish green (pistachio) color, occurring granular, massive, columnar, and in monoclinic crystals. It is a silicate of alumina, lime, and oxide of iron, or manganese.

he patient falls suddenly to the ground; a disease characterized by paroxysms (or fits) occurring at interval and attended by sudden loss of consciousness, and convulsive motions of the muscles. Dunglison.

A fixed point of time, established in history by the occurrence of some grand or remarkable event; a point of time marked by an event of great subsequent influence; as, the epoch of the creation; the birth of Christ was the epoch which gave rise to the Christian era. In divers ages, . . . divers epochs of time were use…

ver notes a phenomenon, as the transit of a star, and the assumed instant of its actual occurrence; or, relatively, the difference between these instants as noted by two observers. It is usually only a fraction of a second; -- sometimes applied loosely to differences of judgment or method occasioned by temperamental qu…

Leakage or loss of currents from the conducting wires, caused by defective insulation. Escape pipe (Steam Boilers), a pipe for carrying away steam that escapes through a safety valve. -- Escape valve (Steam Engine), a relief valve; a safety valve. See under Relief, and Safety. -- Escape wheel (Horol.), the wheel of a…

A passage, as the mouth of a river or lake, where the tide meets the current; an arm of the sea; a frith. it to the sea was often by long and wide estuaries. Dana.

A mineral occurring in transparent emerald green crystals. It is hydrous arseniate of copper.

A brittle gem occurring in light green, transparent crystals, affording a brilliant clinodiagonal cleavage. It is a silicate of alumina and glucina.

A rock occurring in the Alps, consisting of saussurite and smaragdite; -- sometimes called gabbro.

A strait; a narrow tract of water, where the tide, or a current, flows and reflows with violence, as the ancient fright of this name between Eubæa and Bæotia. Hence, a flux and reflux. Burke.

tree. Milton. Wherein (if we only except the unfitness of the judge) all other things concurred. Bp. Stillingfleet.

n expressed in the coin or standard of another, as the value of the pound sterling in the currency of France or the United States. The par of exchange rarely varies, and serves as a measure for the rise and fall of exchange that is affected by the demand and supply. Exchange is at par when, for example, a bill in New Y…