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sp., one whose perimeter consists of more than four sides; any figure having many angles. Polygon of forces (Mech.), a polygonal figure, the sides of which, taken successively, represent, in length and direction, several forces acting simultaneously upon one point, so that the side necessary to complete the figure repr…

Of or pertaining to a natural order of apetalous plants (Polygonaceæ), of which the knotweeds (species of Polygonum) are the type, and which includes also the docks (Rumex), the buckwheat, rhubarb, sea grape (Coccoloba), and several other genera.

Having many angles. Polygonal numbers, certain figurate numbers. See under Figurate.

Having two or more broods in a season.

The doctrine of polygons; an extension of some of the principles of trigonometry to the case of polygons.

Polygonal.

A genus of plants embracing a large number of species, including bistort, knotweed, smartweed, etc.

Any plant of the genus Polygonum.

Approximately polygonal; somewhat or almost polygonal.

The common bistort or snakeweed (Polygonum bistorta).

ee Alternate. -- Angle bar. (a) (Carp.) An upright bar at the angle where two faces of a polygonal or bay window meet. Knight. (b) (Mach.) Same as Angle iron. -- Angle bead (Arch.), a bead worked on or fixed to the angle of any architectural work, esp. for protecting an angle of a wall. -- Angle brace, Angle tie (Ca…

The perpendicular from the center to one of the sides of a regular polygon.

A projecting part of a building, esp. of a church, having in the plan a polygonal or semicircular termination, and, most often, projecting from the east end. In early churches the Eastern apse was occupied by seats for the bishop and clergy. Hence:

In early times, a separate building, usually polygonal, used for baptismal services. Small churches were often changed into baptisteries when larger churches were built near.

The exterior side of the polygon, or that imaginary line which connects the salient angles of two adjacent bastions.

a bay or recess in a room, and projecting outward from the wall, either in a rectangular, polygonal, or semicircular form; -- often corruptly called a bow window.

The knotgrass (Polygonum aviculare).

An herbaceous plant of the genus Polygonum, section Bistorta; snakeweed; adderwort. Its root is used in medicine as an astringent.

A tool of steel, generally tapering, and of a polygonal form, with from four to eight cutting edges, for smoothing or enlarging holes in metal; sometimes made smooth or without edges, as for burnishing pivot holes in watches; a reamer. The broach for gun barrels is commonly square and without taper.…

A plant (Fagopyrum esculentum) of the Polygonum family, the seed of which is used for food.