any of several varieties of corn whose kernels burst open and puff out when subjected to dry heat.
popped corn.
peanut ( def 4c ).

1810–20, Americanism; short for popped corn. See pop1, -ed2, corn1

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World English Dictionary
popcorn (ˈpɒpˌkɔːn)
1.  a variety of maize having hard pointed kernels that puff up when heated
2.  the puffed edible kernels of this plant
[C19: so called because of the noise the grains make when they swell up and burst on heating]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Computing Dictionary

POPCORN definition

AI system built on POP-2. "The POPCORN Reference Manual", S. Hardy, Essex U, Colchester, 1973.

The Free On-line Dictionary of Computing, © Denis Howe 2010 http://foldoc.org
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Encyclopedia Britannica


a variety of corn (maize), the kernels of which, when exposed to heat or microwaves, are exploded into large fluffy masses. The corn used for popping may be any of about 25 different varieties of Zea mays; the two major types are rice popcorn, in which the grains are pointed at both base and apex, and pearl popcorn, in which the grains are rounded and compact. A popcorn kernel has an extremely hard hull and hard outer endosperm, and within there is a mass of moist, starchy, white endosperm. The moisture is optimally about 13.5 percent. When such kernels are heated to about 400 F (about 200 C), the moisture in the starch turns into steam and builds up pressure until the kernel explodes inside out into a white fluffy, irregular mass, about 20 to 40 times the original size

Learn more about popcorn with a free trial on Britannica.com.

Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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Example sentences
Most companies contract with farmers to grow what they need and this also
  applies to popcorn.
Few see any culinary action more sophisticated than reheating leftovers or
  popping popcorn.
Some want to engage, some to pitch a fit, and some to eat popcorn and watch.
Meanwhile, every country may list dozens of sensitive areas where tariffs can
  still apply, from ports to cars to popcorn.
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