doughnut

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doughnut

(esp US), donut
anything shaped like a ring, such as the reaction vessel of a thermonuclear reactor

doughnut

[′dō‚nət]
(nucleonics)
Also spelled donut.
The toroidal vacuum chamber in which electrons are accelerated in a betatron or synchrotron. Also known as toroid.
An assembly of enriched fissionable material, often doughnut-shaped, used in a thermal reactor to provide a local increase in fast neutron flux for experimental purposes.
(petroleum engineering)
A ring of wedges or a threaded, tapered ring that supports a pipe string.

concrete collar, doughnut

A collar of reinforced concrete which is placed around an existing column so that it can be jacked up; the shrinkage of the concrete causes it to grip the column firmly.
References in periodicals archive ?
She noted that the chain has been informing Medicare beneficiaries when they enter the doughnut hole and become eligible for a 50% discount on brand-name drugs.
CLINICAL PSYCHIATRY NEWS: How many Medicare beneficiaries will fall into the doughnut hole this year?
The size of this doughnut hole will grow in the future, since the basic benefit schedule is indexed to average per person drug spending, which is projected to grow at a rate of more than 8 percent annually.
explains that this doughnut hole is essentially a second deductible that beneficiaries pay under Part D drug coverage.
But there's no wrong time of day for fried cake, whether it comes in the form of frosted chocolate doughnuts or lemon-poppy seed doughnut holes.
Jose Angel Conchello Davila for pushing the government to claim Mexico's rights to hydrocarbons in the doughnut hole.
A small spherical piece of dough may be cooked as a doughnut hole.
A simplified version of this concept is graphically shown in Figure 1, with d referring to the doughnut hole and s referring to the point where the doughnut hole begins.
The cost of closing the doughnut hole could be less than what we might expect because of these partially offsetting reductions in spending on nondrug medical care.
This year, seniors in the doughnut hole will get a 50 percent discount on covered brand-name drugs.
Starting in 2011, people who reach the doughnut hole will receive a 50 percent discount on brand-name drugs.