Russula, rus′ū-la, n. a genus of hymenomycetous fungi—so called from the colour of the pileus in some. [Low L. russulus, reddish—L. russus, red.]

Rust, rust, n. the reddish-brown coating on iron exposed to moisture: anything resembling rust: a disease of cereals and grasses, with brown spots on the leaves, caused by fungi: a corrosive: an injurious habit: any foul matter.—v.i. to become rusty: to become dull by inaction.—v.t. to make rusty: to impair by time and inactivity.—adjs. Rust′-col′oured; Rust′ful.—adv. Rust′ily.—ns. Rust′iness; Rust′-mite, certain mites of the family of gall-mites.—adjs. Rust′-proof, not liable to rust; Rust′y, covered with rust: impaired by inactivity, out of practice: dull: affected with rust-disease: time-worn: of a rusty black: rough: obstinate: discoloured.—ns. Rust′y-back, a fern; Rust′y-black′bird, the grackle; Black′-rust, a fungus with dark-coloured spores.—Ride, or Turn, rusty, to become obstinate or stubborn in opposition. [A.S. rust; Ger. rost.]

Rustic, rus′tik, adj. pertaining to the country: rural: rude: awkward: simple: coarse: artless: unadorned: made of rustic-work.—n. a peasant: a clown: a noctuoid moth.—adj. Rus′tical.—adv. Rus′tically.—n. Rus′ticalness.—v.t. Rus′ticate, to send into the country: to banish for a time from town or college.—v.i. to live in the country.—n. Rusticā′tion.—v.i. Rus′ticise.—ns. Rustic′ity, rustic manner: simplicity: rudeness; Rustic′ola, the European woodcock; Rus′tic-ware, a terra-cotta of a light-brown paste, having a brown glaze; Rus′tic-work, various stonework, as frosted work, punctured work, &c.: in woodwork, summer-houses, &c. [Fr. rustique—L. rusticusrus, the country.]

Rustle, rus′l, v.i. to make a soft, whispering sound, as silk, straw, &c.: (U.S.) to stir about.—n. a quick succession of small sounds, as that of dry leaves: a rustling, a movement with rustling sound.—ns. Rus′tler, one who, or that which, rustles: (U.S.) an active fellow; Rus′tling, a quick succession of small sounds, as that of dry leaves.—adv. Rus′tlingly. [Skeat makes it a freq. of Sw. rusta, to stir, a variant of Old Sw. ruska, to shake. Cf. Rush; and cf. Ger. rauschen, ruschen, to rustle.]

Rustre, rus′tėr, n. (her.) a lozenge pierced with a circular opening.—adj. Rus′tred. [Fr.]

Rusure, rōō′zhūr, n. (prov.) the sliding down of a bank.

Rut, rut, n. a track left by a wheel: an established course.—v.t. to form ruts in:—pr.p. rut′ting; pa.t. and pa.p. rut′ted.—adj. Rut′ty, full of ruts. [O. Fr. route—Low L. rupta, a way.]

Rut, rut, n. the noise made by deer during sexual excitement: the periodic time of heat of animals.—v.i. to be in heat.—v.t. (rare) to copulate with.—adj. Rut′tish, inclined to rut: lustful.—n. Rut′tishness, libidinousness. [O. Fr. ruit, rut—L. rugitusrugīre, to roar.]

Ruta, rōō′ta, n. a genus of polypetalous plants—the general name of the species is Rue.—adj. Rutā′ceous. [Gr. hrytē, rue.]

Rutabaga, rōō-ta-bā′ga, n. the Swedish turnip. [Fr.; ety. unknown.]