{ }, n. (Zool.) The urus. [ 1913 Webster ]

n. [ OE. ure, OF. oevre, ovre, ouvre, work, F. œuvre, L. opera. See Opera, Operate, and cf. Inure, Manure. ] Use; practice; exercise. [ Obs. ] Fuller. [ 1913 Webster ]

Let us be sure of this, to put the best in ure
That lies in us. Chapman. [ 1913 Webster ]

v. t. To use; to exercise; to inure; to accustom by practice. [ Obs. ] [ 1913 Webster ]

The French soldiers . . . from their youth have been practiced and ured in feats of arms. Sir T. More. [ 1913 Webster ]

a. [ NL. See Urine. ] (Physiol. Chem.) A very soluble crystalline body which is the chief constituent of the urine in mammals and some other animals. It is also present in small quantity in blood, serous fluids, lymph, the liver, etc. [ 1913 Webster ]

☞ It is the main product of the regressive metamorphosis (katabolism) of proteid matter in the body, and is excreted daily to the amount of about 500 grains by a man of average weight. Chemically it is carbamide, CO(NH2)2, and when heated with strong acids or alkalies is decomposed into carbonic acid and ammonia. It unites with acids to form salts, as nitrate of urea, and it can be made synthetically from ammonium cyanate, with which it is isomeric. [ 1913 Webster ]

Urea ferment, a soluble ferment formed by certain bacteria, which, however, yield the ferment from the body of their cells only after they have been killed by alcohol. It causes urea to take up water and decompose into carbonic acid and ammonia. Many different bacteria possess this property, especially Bacterium ureae and Micrococcus ureae, which are found abundantly in urines undergoing alkaline fermentation. [ 1913 Webster ]

a. Of or pertaining to urea; containing, or consisting of, urea; as, ureal deposits. [ 1913 Webster ]

n. [ Urea + -meter. ] (Physiol. Chem.) An apparatus for the determination of the amount of urea in urine, in which the nitrogen evolved by the action of certain reagents, on a given volume of urine, is collected and measured, and the urea calculated accordingly. [ 1913 Webster ]

n. (Chem.) A glucoside extracted from the leaves of a certain plant (Urechitis suberecta) as a bitter white crystalline substance. [ 1913 Webster ]

n. [ Urechitin + toxic + -in. ] (Chem.) A poisonous glucoside found accompanying urechitin, and extracted as a bitter white crystalline substance. [ 1913 Webster ]

prop. n. pl. (Biol.) An order of fungi of the phylum Basidiomycota, comprising the rust fungi. [ PJC ]

The order Uredinales includes between an estimated 5, 000 and 7, 000 species of diverse plant pathogens. They have been around since the Carboniferous Age (250-300 million years ago), and were well established on the very first ferns. Members of Uredinales are well enough adapted that they inhabit every continent except for Antarctica. Commonly known as the "rust fungi," they attack nearly all types of plant life, and are economically devastating to many crops. Members of Uredinales have a very diverse and complex life cycle-that may affect more than one host family and include up to five different stages.

Morphological Features:
Uredinales includes both autoecious and heteroecious parasites. Autoecious genera infect only one plant host, while heteroecious genera carry out different parts of their life cycle on two different hosts. One example of a heteroecious fungus, Puccinia graminis, the black stem rust of wheat, requires both the barberry bush and a grass to complete its complicated life cycle.

Life cycles of Uredinales are very diverse and complex. Some genera have up to five stages of their life cycle: Spermagonia, Aecia, Uredinia, Telia, and Basidia. Spores are produced in each stage with differing ploidy: spermatia (n), aeciospores (n+n), unidiniospores (n+n), teliospores (n+n to 2n), and basidiospores (n). Genera that do not exhibit all five of these stages either show three or four instead.

Ecology:

Uredinales comprise the most devastating plant pathogens of all Basidiomycota. Genera of Uredinales are responsible for diseases such as: coffee rust, cedar-apple rust, black stem rust of cereals, carnation rust, and peanut rust. There are thousands of other rusts that haven't been listed that are also responsible for being seriously detrimental to many genera of plants.

Despite all of the ecological problems that these fungi cause to plants, recent efforts have attempted to use some of these rusts to control weedy pests.
Kari Jensen (University of Wisconsin, course material)
[ available at: https://web.archive.org/web/20030610224714/http://botit.botany.wisc.edu/courses/Botany_332/uredinales.html ] [ PJC ]

‖n. [ L., a blast, blight, a burning itch, fr. urere to burn, to scorch. ] [ 1913 Webster ]

1. (Bot.) One of the stages in the life history of certain rusts (order Uredinales), regarded at one time as a distinct genus. It is a summer stage preceding the teleutospore, or winter stage. See Uredinales, in the Supplement. [ 1913 Webster ]

2. (Med.) Nettle rash. See Urticaria. [ 1913 Webster ]