Ru*the"ni*ous (?), a. (Chem.) Pertaining to, or containing, ruthenium; specifically, designating those compounds in which it has a lower valence as contrasted with ruthenic compounds.

Ru*the"ni*um (?), n. [NL. So named from the Ruthenians, a Little Russian people, as coming from Russia, the metal having been found in the Ural mountains.] (Chem.) A rare element of the light platinum group, found associated with platinum ores, and isolated as a hard, brittle steel-gray metal which is very infusible. Symbol Ru. Atomic weight 103.5. Specific gravity 12.26. See Platinum metals, under Platinum.

Ruth"ful (?), a. Full of ruth; as: (a) Pitiful; tender. (b) Full of sorrow; woeful. (c) Causing sorrow. Shak. -- Ruth"ful*ly, adv.

Ruth"less, a. Having no ruth; cruel; pitiless.

Their rage the hostile bands restrain,
All but the ruthless monarch of the main.

Pope.

-- Ruth"less*ly, adv. -- Ruth"less*ness, n.

Ru"tic (r"tk), a. [Cf. Rutaceous.] (Chem.) Pertaining to, or obtained from, rue (Ruta); as, rutic acid, now commonly called capric acid.

Ru"ti*lant (&?;), a. [L. rutilans, p. pr. of rutilare to have a reddish glow, fr. rutilus red: cf. F. rutilant.] Having a reddish glow; shining.

Parchments . . . colored with this rutilant mixture.

Evelyn.

Ru"ti*late (?), v. i. [L. rutilare, rutilatum.] To shine; to emit rays of light. [Obs.] Ure.

Ru"tile (r"tl), n. [L. rutilus red, inclining to golden yellow.] (Min.) A mineral usually of a reddish brown color, and brilliant metallic adamantine luster, occurring in tetragonal crystals. In composition it is titanium dioxide, like octahedrite and brookite.

Ru*til"i*an (r*tl"*an), n. (Zoöl.) Any species of lamellicorn beetles belonging to Rutila and allied genera, as the spotted grapevine beetle (Pelidnota punctata).

Ru"tin (r"tn), n. (Chem.) A glucoside resembling, but distinct from, quercitrin. Rutin is found in the leaves of the rue (Ruta graveolens) and other plants, and obtained as a bitter yellow crystalline substance which yields quercitin on decomposition.

Rut"ter (rt"tr), n. [D. ruiter a rider. Cf. Ruttier.] A horseman or trooper. [Obs.]

Such a regiment of rutters
Never defied men braver.

Beau. & Fl.

Rut"ter, n. [From Rut.] That which ruts.

Rut"ter*kin (?), n. An old crafty fox or beguiler -- a word of contempt. [Obs.] Cotgrave.

Rut"ti*er (?), n. [F. routier, fr. route a road. See Route.] A chart of a course, esp. at sea. [Obs.]

Rut"tish (?), a. Inclined to rut; lustful; libidinous; salacious. Shak. -- Rut"tish*ness, n.

Rut"tle, n. A rattling sound in the throat arising from difficulty of breathing; a rattle. [Obs.]

Rut"ty (?), a. Ruttish; lustful.

Rut"ty, a. Full of ruts; as, a rutty road.

Rut"ty, a. [See Root.] Rooty. [Obs.] Spenser.

Ru"ty*lene (?), n. (Chem.) A liquid hydrocarbon, C10H18, of the acetylene series. It is produced artificially.

Ry"al (? or ?), a. Royal. [Obs.] Chaucer.

Ry"al (?), n. See Rial, an old English coin.

Ry"der (?), n. 1. A clause added to a document; a rider. See Rider. [Obs.]

2. [D. rijder, properly, a rider.] A gold coin of Zealand [Netherlands] equal to 14 florins, about $ 5.60.

Rye (?), n. [OE. rie, reie, AS. ryge; akin to Icel. rugr, Sw. råg, Dan. rug, D. rogge, OHG. rocco, roggo, G. rocken, roggen, Lith. rugei, Russ. roje, and perh. to Gr. 'o`ryza rice. Cf. Rice.] 1. (Bot.) A grain yielded by a hardy cereal grass (Secale cereale), closely allied to wheat; also, the plant itself. Rye constitutes a large portion of the breadstuff used by man.

2. A disease in a hawk. Ainsworth.

Rye grass, Italian rye grass, (Bot.) See under Grass. See also Ray grass, and Darnel. -- Wild rye (Bot.), any plant of the genus Elymus, tall grasses with much the appearance of rye.

Rynd (? or ?), n. [Etymol. uncertain.] A piece of iron crossing the hole in the upper millstone by which the stone is supported on the spindle.

Ry"ot (r"t), n. [Ar. & Hind. ra'iyat, the same word as ra'iyah, a subject, tenant, peasant. See Rayah.] A peasant or cultivator of the soil. [India]

The Indian ryot and the Egyptian fellah work for less pay than any other laborers in the world.

The Nation.

Ry*poph"a*gous (r*pf"*gs), a. [Gr. "ry`pos filth + fagei^n to eat.] (Zoöl.) Eating, or subsisting on, filth.

Rys (rs or rs), n. A branch. [Obs.] Chaucer.

Rysh (rsh), n. Rush, a plant. [Obs.] Chaucer.

Ry*sim"e*ter (?), n. See Rhysimeter.

Ryth (rth), n. [Cf. AS. rið brook.] A ford. [Obs.]

||Ryt"i*na (?), n. [NL., fr. Gr. "ryti`s a wrinkle.] (Zoöl.) A genus of large edentulous sirenians, allied to the dugong and manatee, including but one species (R. Stelleri); -- called also Steller's sea cow. [Written also Rhytina.]

It is now extinct, but was formerly abundant at Behring's Island, near Behring's Straits. It was twenty-five feet or more in length, with a thick, blackish, naked skin. The last were killed in 1768 for their oil and flesh.