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Opposite to the sun; -- said of the point in the heavens 180º distant from the sun.

an animal), capable of producing immunity from certain diseases, or of counteracting the poisonous effects of pathogenic bacteria.

Good against venereal poison; antisyphilitic.

That point in the orbit of a double star where the smaller star is farthest from its primary.

Quadrumana. The higher forms, the gorilla, chimpanzee, and ourang, are often called anthropoid apes or man apes.

The tip, top, point, or angular summit of anything; as, the apex of a mountain, spire, or cone; the apex, or tip, of a leaf.

That point of a planet's or comet's orbit which is most distant from the sun, the opposite point being the perihelion.

Terminated abruptly by a small, distinct point, as a leaf.

to remove spherical aberration; -- said of a lens. Aplanatic focus of a lens (Opt.), the point or focus from which rays diverging pass the lens without spherical aberration. In certain forms of lenses there are two such foci; and it is by taking advantage of this fact that the best aplanatic object glasses of microsco…

That point in the orbit of the moon which is at the greatest distance from the earth.

A figure by which a speaker formally declines to take notice of a favorable point, but in such a manner as to produce the effect desired. [For example, see Mark Antony's oration. Shak., Julius Cæsar, iii. 2.]

To belong or pertain, whether by right, nature, appointment, or custom; to relate. Things appertaining to this life. Hooker. Give it unto him to whom it appertaineth. Lev. vi. 5.

To set a value; to estimate the worth of, particularly by persons appointed for the purpose; as, to appraise goods and chattels.

One who appraises; esp., a person appointed and sworn to estimate and fix the value of goods or estates.

trees that are of any great height, there would be stays and appuies set to it. Holland. Point d'appui. Etym: [F., a point of support.] (Mil.) (a) A given point or body, upon which troops are formed, or by which are marched in line or column. (b) An advantageous defensive support, as a castle, morass, wood, declivity,…

One of the two points of an orbit, as of a planet or satellite, which are at the greatest and least distance from the central body, corresponding to the aphelion and perihelion of a planet, or to the apogee and perigee of the moon. The more distant is called the higher apsis; the other, the lower apsis; and the line jo…

gold, the "royal" metal. -- Aqua Tofana, a fluid containing arsenic, and used for secret poisoning, made by an Italian woman named Tofana, in the middle of the 17th century, who is said to have poisoned more than 600 persons. Francis. -- Aqua vitæ Etym: [L., water of life. Cf. Eau de vie, Usquebaugh], a name given to…

A person appointed, or chosen, by parties to determine a controversy between them.

A mandrel in lathe turning. Knight. Arbor Day, a day appointed for planting trees and shrubs. [U.S.]

ght above an opening. In this sense arches are segmental, round (i. e., semicircular), or pointed.