DONUT

DONUT (Direct Observation of the NU Tau, E872) was an experiment at Fermilab dedicated to the search for tau neutrino interactions. Even though the detector operated only during a few months in the summer of 1997, it was largely successful. By detecting the tau neutrino, it confirmed the existence of the last lepton predicted by the Standard Model...
Found on http://en.wikipedia.org/wiki/DONUT

Donut

A piece of metal with a circle cut out of its centre which is inserted in to the colour frame of a profile-spot in order to reduce spill and scatter from a lantern.
Found on https://www.encyclo.co.uk/local/20411

donut

A television interview in which the studio presenter hands over to a journalist on location who interviews guests before handing back to the presenter in the studio. Term used mainly by the BBC. See also two-way.
Found on http://www.thenewsmanual.net/Resources/glossary.html

Donut

Circular shaped weight that slides over the bat. The weight is used when a player is loosening up in
Found on http://www.superglossary.com/Glossary/Entertainment/Baseball/

Donut

If you score zero (0) games in a set this may be referred to as a Donut.
Found on https://www.encyclo.co.uk/local/22355

Donut

No, it doesn't contain jam. It's an interview on location in which the presenter in the studio hands over to the presenter on location. They describe the situation and interview a guest before handing back to the presenter in the studio.
Found on http://news.bbc.co.uk/1/hi/school_report/4791411.stm
No exact match found