| slovo | definícia |
Puccinia graminis
(gcide) | 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 (Zool.), a minute mite (Phytopius oleivorus)
which, by puncturing the rind, causes the rust-colored
patches on oranges.
[1913 Webster] |
Puccinia graminis
(gcide) | 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.] |
Puccinia graminis
(gcide) | 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; --
contrasted with aut[oe]cious. -- Het`er*[oe]"cism, n.
[Webster 1913 Suppl.] |
puccinia graminis
(wn) | Puccinia graminis
n 1: rust fungus that attacks wheat [syn: wheat rust,
Puccinia graminis] |
| |