Etymology
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food (n.)

Middle English foode, fode, from Old English foda "food, nourishment; fuel," also figurative, from Proto-Germanic *fodon (source also of Swedish föda, Danish föde, Gothic fodeins), from Germanic *fod- "food," from PIE *pat-, extended form of root *pa- "to feed."

Food chain is by 1915. Food poisoning attested by 1864; food processor in the kitchen appliance sense from 1973; food stamp (n.) is from 1962.

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fish-food (n.)

 1863, "food for (pet or hobby) fish;" 1860, "fish as food for humans;" from fish (n.) + food

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foodoholic (n.)
1965, formed irregularly from food + -aholic.
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foodstuff (n.)
"substance or material suitable for food," 1870, from food + stuff (n.). Related: Foodstuffs.
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seafood (n.)

also sea-food, "food obtained from the sea," 1836, American English, from sea + food.

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*pa- 
*pā-, Proto-Indo-European root meaning "to protect, feed."

It forms all or part of: antipasto; appanage; bannock; bezoar; companion; company; feed; fodder; food; forage; foray; foster; fur; furrier; impanate; pabulum; panatela; panic (n.2) "type of grass;" pannier; panocha; pantry; pastern; pastor; pasture; pester; repast; satrap.

It is the hypothetical source of/evidence for its existence is provided by: Greek pateisthai "to feed;" Latin pabulum "food, fodder," panis "bread," pasci "to feed," pascare "to graze, pasture, feed," pastor "shepherd," literally "feeder;" Avestan pitu- "food;" Old Church Slavonic pasti "feed cattle, pasture;" Russian pishcha "food;" Old English foda, Gothic fodeins "food, nourishment."
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FDA 
U.S. Food and Drug Administration, 1930, shortened from Food, Drug, and Insecticide Administration.
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trophic (adj.)
"of or pertaining to nutrition, food, or nourishment," 1856, from Greek trophikos, from trophe "nourishment, food" (see -trophy).
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sitophobia (n.)
"morbid aversion to food" (or certain foods), 1882, from Greek sitos "wheat, corn, meal; food," of unknown origin, + -phobia. Related: Sitophobe; sitophobic.
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