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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.

the 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…

erver 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…

eniate of copper, of an emerald-green color; -- so called from Erin, or Ireland, where it occurs.

oint, spreads gradually over its surface. It is usually regarded as contagious, and often occurs epidemically.

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.

as little affect on the signification. It becomes ef- before f, as in effuse. The form e- occurs instead of ex- before b, d, g, l, m, n, r, and v, as in ebullient, emanate, enormous, etc. In words from the French it often appears as es-, sometimes as s- or é-; as, escape, scape, élite. Ex-, prefixed to names implying o…

Continued or repeated manifestation; occurrence, as of events of any kind; as, the existence of a calamity or of a state of war. The existence therefore, of a phenomenon, is but another word for its being perceived, or for the inferred possibility of perceiving it. J. S. Mill.

Having being or existence; existing; being; occurring now; taking place. The eyes and mind are fastened on objects which have no real being, as if they were truly existent. Dryden.

y) which depends upon some contingent event. Expectations are computed for or against the occurrence of the event.

; either, first by noticing facts without any attempt to influence the frequency of their occurrence or to vary the circumstances under which they occur; this is observation; or, secondly, by putting in action causes or agents over which we have control, and purposely varying their combinations, and noticing what effec…

That which makes the eyes open, as startling news or occurrence, or (U. S. Slang), a drink of liquor, esp. the first one in the morning.

To come; to occur; to arrive. The vernal equinox, which at the Nicene Council fell on the 21st of March, falls now [1694] about ten days sooner. Holder.

gas or methane series. -- Natural fats (Chem.), the group of oily substances of natural occurrence, as butter, lard, tallow, etc., as distinguished from certain fatlike substance of artificial production, as paraffin. Most natural fats are essentially mixtures of triglycerides of fatty acids.

id, acetic, etc.; -- so called because the higher members, as stearic and palmitic acids, occur in the natural fats, and are themselves fatlike substances. -- Fatty clays. See under Clay. -- Fatty degeneration (Med.), a diseased condition, in which the oil globules, naturally present in certain organs, are so multipl…

nd all silicates of alumina with either potash, soda, lime, or, in one case, baryta. They occur in crystals and crystalline masses, vitreous in luster, and breaking rather easily in two directions at right angles to each other, or nearly so. The colors are usually white or nearly white, flesh-red, bluish, or greenish.…

an alternating current converter, accompanied by other changes in electrical conditions, occurring when the secondary of the converter is connected with a condenser of moderate capacity; -- so called because first observed in connection with the Ferranti cables in London.