Puccinia graminis
Rust Rust, n. [AS. rust; akin to D. roest, G. & Sw. rost, Icel. ry[eth]; -- named from its color, and akin to E. red. [root]113. See {Red}.] 1. (Chem.) The reddish yellow coating formed on iron when exposed to moist air, consisting of ferric oxide or hydroxide; hence, by extension, any metallic film of corrosion. [1913 Webster]

2. (Bot.) A minute mold or fungus forming reddish or rusty spots on the leaves and stems of cereal and other grasses ({Trichobasis Rubigo-vera}), now usually believed to be a form or condition of the corn mildew ({Puccinia graminis}). As rust, it has solitary reddish spores; as corn mildew, the spores are double and blackish. [1913 Webster]

Note: Rust is also applied to many other minute fungi which infest vegetation, such as the species of {Ustilago}, {Uredo}, and {Lecythea}. [1913 Webster]

3. That which resembles rust in appearance or effects. Specifically: (a) A composition used in making a rust joint. See {Rust joint}, below. (b) Foul matter arising from degeneration; as, rust on salted meat. (c) Corrosive or injurious accretion or influence. [1913 Webster]

Sacred truths cleared from all rust and dross of human mixtures. --Eikon Basilike. [1913 Webster]

Note: Rust is used in the formation of compounds of obvious meaning; as, rust-colored, rust-consumed, rust-eaten, and the like. [1913 Webster]

{Rust joint}, a joint made between surfaces of iron by filling the space between them with a wet mixture of cast-iron borings, sal ammoniac, and sulphur, which by oxidation becomes hard, and impervious to steam, water, etc.

{Rust mite} (Zo["o]l.), a minute mite ({Phytopius oleivorus}) which, by puncturing the rind, causes the rust-colored patches on oranges. [1913 Webster]

The Collaborative International Dictionary of English. 2000.

Look at other dictionaries:

  • Puccinia graminis — Rouille noire Rouille noire …   Wikipédia en Français

  • Puccinia graminis — Wheat rust Wheat rust A disease of wheat and other grasses caused by the rust fungus {Puccinia graminis}; also, the fungus itself. [Webster 1913 Suppl.] …   The Collaborative International Dictionary of English

  • Puccinia graminis — Heteroecious Het er*[oe] cious, a. [Hetero + Gr. ? house.] (Bot.) Passing through the different stages in its life history on an alternation of hosts, as the common wheat rust fungus ({Puccinia graminis}), and certain other parasitic fungi;… …   The Collaborative International Dictionary of English

  • Puccinia graminis — noun rust fungus that attacks wheat • Syn: ↑wheat rust • Hypernyms: ↑rust, ↑rust fungus • Member Holonyms: ↑Puccinia, ↑genus Puccinia …   Useful english dictionary

  • Puccinia — Saltar a navegación, búsqueda ? Puccinia Clasificación científica Reino: Fungi Filo …   Wikipedia Español

  • Puccinia — Puccinia …   Wikipédia en Français

  • Puccinia — Taxobox name = Puccinia regnum = Fungi phylum = Basidiomycota classis = Urediniomycetes subclassis = Incertae sedis ordo = Uredinales familia = Pucciniaceae genus = Puccinia subdivision ranks = Species subdivision = P. verruca Puccinia angustata… …   Wikipedia

  • Puccinia — noun type genus of the Pucciniaceae; a large genus of parasitic fungi including many that are destructive to various economic plants • Syn: ↑genus Puccinia • Hypernyms: ↑fungus genus • Member Holonyms: ↑Pucciniaceae, ↑family Pucciniaceae …   Useful english dictionary

  • Puccinĭa — (P. Pers.), Pflanzengattung aus der[677] Familie der Gymnomycetes Eutophyti; Arten: mikroskopische, sich als Linien u. Flecken auf Blättern u. Stängeln von Pflanzen darstellende Kryptogamen; P. graminis (Grasrost, Stielbrand), Anfangs rostfarbene …   Pierer's Universal-Lexikon

  • Puccinia — Puccinĭa Pers., Pilzgattg. der Uredineen, parasitisch auf höhern Pflanzen, meist mit Generationswechsel. Von P. gramĭnis Pers. (Grasrost, Getreiderost) bildet die Äzidiengeneration an den Blättern der Berberitze orangerote Flecke, die Äzidien, in …   Kleines Konversations-Lexikon

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