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At right angles to a given line or surface; as, the line ad is perpendicular to the line bc. Perpendicular style (Arch.), a name given to the latest variety of English Gothic architecture, which prevailed from the close of the 14th century to the early part of the 16th; -- probably so called from the vertical style of…

the art, or in accordance with the laws, of perspective. Perspective plane, the plane or surface on which the objects are delineated, or the picture drawn; the plane of projection; -- distinguished from the ground plane, which is that on which the objects are represented as standing. When this plane is oblique to the…

One of the filaments on the inner surface of the gastric cavity of certain jellyfishes.

lly. It is valuable as a chemical reagent, and is used in the composition of the friction surface on which safety matches are ignited. -- Solar phosphori (Chem.), phosphorescent substances which shine in the dark after exposure to the sunlight or other intense light.

A disproportionately rapid growth of the upper surface of dorsiventral organs, such as leaves, through the stimulus of exposure to light. Encyc. Brit.

Pertaining to, or designating, any photographic process in which a printing surface is obtained without the intervention of hand engraving.

A printing surface in relief, obtained by photographic means and subsequent manipulations. Knight.

A plate or block with a printing surface (usually in relief) obtained from a photograph; also, any one of the many methods of processes by which such a printing surface is obtained.

hypothesis of Gall, that the mental faculties, and traits of character, are shown on the surface of the head or skull; craniology.

al features, climate, life, etc., and of the physical movements or changes on the earth's surface, as the currents of the atmosphere and ocean, the secular variations in heat, moisture, magnetism, etc.; physical geography.

ch. Pick dressing (Arch.), in cut stonework, a facing made by a pointed tool, leaving the surface in little pits or depressions. -- Pick hammer, a pick with one end sharp and the other blunt, used by miners.

f dilute sulphuric or nitric acid, etc., to remove burnt sand, scale rust, etc., from the surface of castings, or other articles of metal, or to brighten them or improve their color.

sentation of anything (as a person, a landscape, a building) upon canvas, paper, or other surface, produced by means of painting, drawing, engraving, photography, etc.; a representation in colors. By extension, a figure; a model. Pictures and shapes are but secondary objects. Bacon. The young king's picture . . . in vi…

ch used as a mordant for madder and cochineal. -- Pink saucer, a small saucer, the inner surface of which is covered with a pink pigment.

A large cavity or hole in the ground, either natural or artificial; a cavity in the surface of a body; an indentation; specifically:

ak. -- Plain dealing. See under Dealing. -- Plain molding (Join.), molding of which the surfaces are plain figures. -- Plain sewing, sewing of seams by simple and common stitches, in distinct from fancy work, embroidery, etc.; -- distinguished also from designing and fitting garments. -- Plain song. (a) The Gregori…

ations or depressions; even; level; flat; lying in, or constituting, a plane; as, a plane surface.

Having opposite surfaces exactly plane and parallel, as a piece of glass.

A wooden block used for forcing down the type in a form, and making the surface even. Hansard. Planer centers. See under Center.

Having a plane surface; as, a planiform, gliding, or arthrodial articulation.