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Having five angles; quinquangular.

The movable limb of a sextant or other angular instrument. Knight. Radius bar (Math.), a bar pivoted at one end, about which it swings, and having its other end attached to a piece which it causes to move in a circular arc. -- Radius of curvature. See under Curvature.

e lever back and forth. -- Ratchet wheel (Mach.), a circular wheel having teeth, usually angular, with which a reciprocating pawl engages to turn the wheel forward, or a stationary pawl to hold it from turning backward.

-- Rattlesnake fern (Bot.), a common American fern (Botrychium Virginianum) having a triangular decompound frond and a long-stalked panicle of spore cases rising from the middle of the frond. -- Rattlesnake grass (Bot.), a handsome American grass (Glyceria Canadensis) with an ample panicle of rather large ovate spik…

) The razor shell. -- Razor grass (Bot.), a West Indian plant (Scleria scindens), the triangular stem and the leaves of which are edged with minute sharp teeth. -- Razor grinder (Zoöl.), the European goat-sucker. -- Razor shell (Zoöl.), any marine bivalve shell belonging to Solen and allied genera, especially Solen,…

A restangular longitudinal recess or groove, cut in the corner or edge of any body; a rabbet. See Rabbet.

Rectangular. [R.]

Rectangular. Hutton.

Bent backward angularly, as if half-broken; as, a refracted stem or leaf.

o refract; as, a refracting medium. Refracting angle of a prism (Opt.), the angle of a triangular prism included between the two sides through which the refracted beam passes in the decomposition of light. -- Refracting telescope. (Opt.) See under Telescope.

as Isometric. Regular polygon (Geom.), a plane polygon which is both equilateral and equiangular. -- Regular polyhedron (Geom.), a polyhedron whose faces are equal regular polygons. There are five regular polyhedrons, -- the tetrahedron, the hexahedron, or cube, the octahedron, the dodecahedron, and the icosahedron.…

An interior corner; a nook; hence, an angular recess or hollow bend in a mountain, river, cliff, or the like. [Western & Southern U. S.] D. S. Jordan.

Cut flat on the reverse, and with a convex face formed of triangular facets in rows; -- said of diamonds and other precious stones. See Rose diamond, under Rose. Cf. Brilliant, n.

or an ellipse, or a portion of the surface of a sphere; rotund; bulging; protuberant; not angular or pointed; as, a round arch; round hills. "Their round haunches gored." Shak.

Shaped like an arrowhead; triangular, with the two basal angles prolonged downward.

In a sawmill, the rectangular frame in which the saw is strained and by which it is carried up and down with a reciprocating motion; - - also called gate. French sash, a casement swinging on hinges; -- in distinction from a vertical sash sliding up and down.

Designating several triangular muscles called scalene muscles.

perennial, endogenous herbs, often growing in dense tufts in marshy places. They have triangular jointless stems, a spiked inflorescence, and long grasslike leaves which are usually rough on the margins and midrib. There are several hundred species.

An instrument for measuring angular distances between objects, -- used esp. at sea, for ascertaining the latitude and longitude. It is constructed on the same optical principle as Hadley's quadrant, but usually of metal, with a nicer graduation, telescopic sight, and its arc the sixth, and sometimes the third, part of…

Composed of hard, angular grains; gritty; as, sharp sand. Moxon.