Search the Dictionary

hich something is completed, and ready to recommence and go on in the same order; as, the period of the sun, or the earth, or a comet.

A salt of periodic acid.

Pertaining to, derived from, or designating, the highest oxygen acid (HIO

Of or pertaining to a period or periods, or to division by periods. The periodicaltimes of all the satellites. Sir J. Herschel.

A magazine or other publication which appears at stated or regular intervals.

One who publishes, or writes for, a periodical.

In a periodical manner.

Periodicity.

The quality or state of being periodical, or regularly recurrent; as, the periodicity in the vital phenomena of plants. Henfrey.

An iodide containing a higher proportion of iodine than any other iodide of the same substance or series.

Surrounding the teeth.

A table or other means for calculating the periodical functions of women. Dunglison.

A period in the American eocene, the lowest in the tertiary age except the lignitic.

A remedy possessing the property of preventing the return of periodic paroxysms, or exacerbations, of disease, as in intermittent fevers.

The closing subdivision of the Devonian age in America. The rocks of this period are well developed in the Catskill mountains, and extend south and west under the Carboniferous formation. See the Diagram under Geology.

A subdivision of the Quaternary age immediately following the Glacial period; -- so named from beds near Lake Champlain.

A subdivision in the upper part of the Devonian system in America, so named from the Chemung River, along which the rocks are well developed. It includes the Portage and Chemung groups or epochs. See the Diagram under Geology.

A subdivision of the Devonian system of America; -- so named from Hamilton, Madison Co., New York. It includes the Marcellus, Hamilton, and Genesee epochs or groups. See the Chart of Geology.

A subdivision or the American Upper Silurian system, embracing the Medina, Clinton, and Niagara epoch. The rocks of the Niagara epoch, mostly limestones, are extensively distributed, and at Niagara Falls consist of about eighty feet of shale supporting a greater thickness of limestone, which is gradually undermined by…

The period in which the American Upper Silurian system, containing the brine-producing rocks of central New York, was formed. See the Chart of Geology.