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Any toxic agent whose action is mainly directed to the great nerve centers.

To gather, as about a nucleus or center.

tube having one end open and the other end covered with a thin flexible membrance to the center of which is attached a small mirror. It is used for exhibiting upon a screen, by means of rays reflected from the mirror, the vibratory motions caused by sounds produced at the open end of the tube, as by speaking or singin…

sometimes called binocular parallax. -- Optic axis. (Opt.) (a) A line drawn through the center of the eye perpendicular to its anterior and posterior surfaces. In a normal eye it is in the direction of the optic axis that objects are most distinctly seen. (b) The line in a doubly refracting crystal, in the direction…

upposed to be placed at an infinite distance, the plane of projection passing through the center of the sphere perpendicularly to the line of sight.

he extreme points of the oscillation were not very remote. Macaulay. Axis of oscillation, Center of oscillation. See under Axis, and Center.

ther from the interior, from a given station, or from any space or position regarded as a center or starting place; -- opposed to inner; as, the outer wall; the outer court or gate; the outer stump in cricket; the outer world. Outer bar, in England, the body of junior (or utter) barristers; -- so called because in cour…

A part remote from the center; outer edge; border; -- usually in the plural; as, the outskirts of a town. Wordsworth. The outskirts of his march of mystery. Keble.

A street remote from the center of a town. Johnson.

Palmate, with the divisions separated but little more than halfway to the common center.

Palmate, with the divisions separated less than halfway to the common center.

after its secession. That adopted in November, 1860, had a green cabbage palmetto in the center of a white field; the final one, January, 1861, had a white palmetto in the center of a blue field and a white crescent in the upper left-hand corner.

ome zoölogists considered a distinct species. It is marked with large ringlike spots, the centers of which are darker than the color of the body.

Having a minute papilla in the center of a larger elevation or depression.

Deviating from circularity; changing the distance from a center. Paracentric curve (Math.), a curve having the property that, when its plane is placed vertically, a body descending along it, by the force of gravity, will approach to, or recede from, a fixed point or center, by equal distances in equal times; -- called…

nt on the earth's surface, and as seen from some other conventional point, as the earth's center or the sun. Annual parallax, the greatest value of the heliocentric parallax, or the greatest annual apparent change of place of a body as seen from the earth and sun; as, the annual parallax of a fixed star. -- Binocular…

A picture, or combination of pictures, consisting of a centerpiece and double folding doors or wings, as for an altarpiece.

he body; if some interventing substance, as a pleximeter, is, used, it is called mediate. Center of percussion. See under Center. -- Percussion bullet, a bullet containing a substance which is exploded by percussion; an explosive bullet. -- Percussion cap, a small copper cap or cup, containing fulminating powder, and…

External; away from the center; as, the peripheral portion of the nervous system.

t angles to the plane of the horizon; extending in a right line from any point toward the center of the earth.