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corn (n.1)

"grain," Old English corn "single seed of a cereal plant; seeds of cereal plants generally; plants which produce corn when growing in the field," from Proto-Germanic *kurnam "small seed" (source also of Old Frisian and Old Saxon korn "grain," Middle Dutch coren, German Korn, Old Norse korn, Gothic kaurn), from PIE root *gre-no- "grain."

The sense of the Old English word was "grain with the seed still in" (as in barleycorn) rather than a particular plant. Locally understood to denote the leading crop of a district. It has been restricted to the indigenous "maize" in America (c. 1600, originally Indian corn, but the adjective was dropped), usually "wheat" in England, "oats" in Scotland and Ireland, while Korn means "rye" in parts of Germany.

Maize was introduced to China by 1550, it thrived where rice did not grow well and was a significant factor in the 18th century population boom there. Corn-starch is from 1850. Corn-silk is attested from 1852.

corn (n.2)

"hardening or thickening of skin," early 15c., corne, from Old French corne (13c.) "horn (of an animal)," later "a corn on the foot," from Latin cornu "horn of an animal," from PIE root *ker- (1) "horn; head."

Latin cornu was used of many things similar in substance or form to the horns of animals and of projecting extremities or points: It could mean "a wart, a branch of a river, a tongue of land, the end of a bow or sail-yard, the peak of a mountain, a bugle, a wing of an army," or "the stiff hair of the Germans."

corn (v.)

1550s, "to form into grains, granulate," from corn (n.1). From 1560s as "to preserve and season with grains ('corns') of salt." From 1785 (in corned) as "make drunk," as with corn whiskey. Corned beef has nothing to do with the grain; it is so called for the "corns" or "grains" of salt with which it is preserved.

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Definitions of corn
1
corn (n.)
tall annual cereal grass bearing kernels on large ears: widely cultivated in America in many varieties; the principal cereal in Mexico and Central and South America since pre-Columbian times;
Synonyms: maize / Indian corn / Zea mays
corn (n.)
the dried grains or kernels or corn used as animal feed or ground for meal;
corn (n.)
ears of corn that can be prepared and served for human food;
Synonyms: edible corn
corn (n.)
a hard thickening of the skin (especially on the top or sides of the toes) caused by the pressure of ill-fitting shoes;
Synonyms: clavus
corn (n.)
(Great Britain) any of various cereal plants (especially the dominant crop of the region--wheat in Great Britain or oats in Scotland and Ireland);
corn (n.)
whiskey distilled from a mash of not less than 80 percent corn;
Synonyms: corn whiskey / corn whisky
corn (n.)
something sentimental or trite;
that movie was pure corn
2
corn (v.)
feed (cattle) with corn;
corn (v.)
preserve with salt;
corned beef
From wordnet.princeton.edu