Etymology
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eat (v.)

Old English etan (class V strong verb; past tense æt, past participle eten) "to consume food, devour, consume," from Proto-Germanic *etan (source also of Old Frisian ita, Old Saxon etan, Middle Dutch eten, Dutch eten, Old High German ezzan, German essen, Old Norse eta, Gothic itan), from PIE root *ed- "to eat."

Transferred sense of "corrode, wear away, consume, waste" is from 1550s. Meaning "to preoccupy, engross" (as in what's eating you?) first recorded 1893. Slang sexual sense of "do cunnilingus on" is first recorded 1927. The slang phrase eat one's words "retract, take back what one has uttered" is from 1570s; to eat one's heart out is from 1590s; for eat one's hat, see hat. Eat-in (adj.) in reference to kitchens is from 1955. To eat out "dine away from home" is from 1930.

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ate 
past tense of eat (q.v.).
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eaten 
Old English eten, past participle of eat.
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eater (n.)
Old English etere "one who eats," especially a servant or retainer, agent noun from eat (v.)). From 17c. in compounds with various objects or substances eaten.
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ant-eater (n.)
also anteater, 1764, in reference to the South American species; 1868 of the Australian echidna; from ant + agent noun from eat (v.).
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overeat (v.)

"to eat too much," 1590s, from over- + eat (v.). Related: Overate; overeating. Old English had oferæt (n.) "gluttony;" oferæte (adj.) "gluttonous, excessive eating."

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aristology (n.)
"science of dining," 1835, with -ology "study of" + Greek ariston "breakfast, the morning meal" (later "the mid-day meal"), a contraction of a locative ari- (see ere) + *ed- "to eat" (see eat). Related: Aristological; aristologist.
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esurient (adj.)

"inclined to eat," 1670s, from Latin esurientem (nominative esuriens), present participle of esurire "be hungry, hunger, desire to eat," from stem of edere "to eat" (from PIE root *ed- "to eat"). Related: Esurience; esuriency.

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