Etymology
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sedge (n.)

"coarse grass-like plant growing in wet places," Middle English segge, from Old English secg "sedge, reed, rush," according to Watkins from Proto-Germanic *sagjaz "plant with a cutting edge" (source also of Low German segge, German Segge), from suffixed form of PIE root *sek- "to cut," on notion of plant with "cutting" leaves.

Compare Old English secg, identical in form but meaning "sword;" and German schwertel-gras "sedge" from schwert "sword," also see the etymological sense of gladiolus). Old Irish seisg, Welsh hesgreed "rush" might represent a similar sense development from the same root. Often spelled seg, segg until the present form triumphed early 1900s. Related: Sedgy (early 14c., seggy).

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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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musket (n.)

"firearm for infantry" (later replaced by the rifle), 1580s, from French mousquette, also the name of a kind of sparrow-hawk, diminutive of mosca "a fly," from Latin musca (see midge). The hawk so called either for its size or because it looks speckled when in flight.

Early firearms often were given names of beasts (compare dragoon, also falcon, a kind of cannon mentioned by Hakluyt), and the equivalent word in Italian was used to mean "an arrow for a crossbow." Wedgwood also compares culverin, a simple early sort of firearm, from French couleuvrine, from couleuvre "grass snake."

French mousquette had been borrowed earlier into Middle English (late 14c.; c. 1200 as a surname) in its literal sense of "sparrow-hawk."

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*sen- 

Proto-Indo-European root meaning "old."

It forms all or part of: monseigneur; seignior; senate; senescent; seneschal; senicide; senile; senility; senior; seniority; senor; senora; senorita; shanachie; Shannon; signor; sir; sire; surly.

It is the hypothetical source of/evidence for its existence is provided by: Sanskrit sanah "old;" Avestan hana- "old," Old Persian hanata- "old age, lapse of time;" Armenian hin "old;" Greek enos "old, of last year;" Latin senilis "of old age," senex "old, old man;" Lithuanian senas "old," senis "an old man;" Gothic sineigs "old" (used only of persons), sinistra "elder, senior;" Old Norse sina "dry standing grass from the previous year;" Old Irish sen, Old Welsh hen "old."

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rye (n.)

type of cereal plant widely cultivated in central and northern Europe, Old English ryge, from Proto-Germanic *ruig (source also of Old Saxon roggo, Old Norse rugr, Old Frisian rogga, Middle Dutch rogghe, Old High German rocko, German Roggen), related to or from Balto-Slavic words (such as Old Church Slavonic ruži, Russian rozh' "rye;" Lithuanian rugys "grain of rye," plural rugiai), from a European PIE root *wrughyo- "rye."

It makes the black bread of Germany and Russia; hence rye, short for rye-bread, by 1941 in U.S. restaurant jargon. The roast grains also were formerly used as a coffee substitute. It makes kvass in Russia, gin in Holland, and much whiskey in the U.S., hence the general meaning "whiskey" (made from rye), attested by 1835. Rye-bread "bread made from rye flour" is attested from mid-15c.

The rye of Exodus ix.32, etc. probably is spelt. In German peasant folklore the Roggenwolf ("rye-wolf") was a malignant spirit supposed to haunt rye-fields.

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lemon (n.1)

"ovate, pale yellow citrus fruit," c. 1400, lymon, from Old French limon "citrus fruit" (12c.), which comes via Provençal or Italian from Arabic laimun, Persian limun. Apparently brought from India to the Levant by the Arabs 9c. or 10c.; the word is perhaps ultimately from an Austronesian word of the Malay archipelago, such as Balinese limo "lemon," Malay limaw "citrus fruit, lime" (compare lime (n.2)).

Meaning "person with a tart disposition" is from 1863. For the sense "worthless thing," see lemon (n.2). Slang meaning "a Quaalude" is 1960s, from Lemmon, name of a pharmaceutical company that once manufactured the drug. The surname is from Middle English leman "sweetheart, lover." Lemon-juice is attested from 1610s; the candy lemon-drop from 1807. The East Indian lemon-grass (1837) is so called for its smell.

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redundant (adj.)

"superfluous, exceeding what is natural or necessary," c. 1600, from Latin redundantem (nominative redundans), present participle of redundare, literally "overflow, pour over; be over-full;" figuratively "be in excess," from re- "again" (see re-) + undare "rise in waves," from unda "a wave" (from PIE *unda-, nasalized form of root *wed- (1) "water; wet").

Also sometimes in 17c. in a more positive sense, "abounding to excess or fullness, exuberant, plentiful," e.g. in "Paradise Lost," though what he meant by it here is anyone's guess:

With burnished neck of verdant gold, erect
Amidst his circling spires that on the grass
Floated redundant.

 Of persons, in employment situations by 1928, chiefly British. Related: Redundantly. As a verb, redund has been tried at least once (1904); the etymological corresponding verb is the Frenchified redound.

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oat (n.)

type of cereal plant, Middle English ote, from Old English ate (plural atan) "grain of the oat plant, wild oats," a word of uncertain origin, possibly from Old Norse eitill "nodule," denoting a single grain, itself of unknown origin. The English word has cognates in Frisian and some Dutch dialects. Famously defined by Johnson as, "A grain, which in England is generally given to horses, but in Scotland supports the people." Related: Oats.

The usual Germanic name is derived from Proto-Germanic *khabran (source also of Old Norse hafri, Dutch haver, source of haversack). Figurative wild oats "youthful excesses" (the notion is "crop that one will regret sowing") is attested by 1560s, in reference to the folly of sowing these instead of good grain. Hence, feel (one's) oats "be lively," 1831, originally American English.

That wilfull and vnruly age, which lacketh rypenes and discretion, and (as wee saye) hath not sowed all theyr wyeld Oates. [Thomas Newton, "Lemnie's Touchstone of complexions," 1576]
Fred: I still want to sow some wild oats!
Lamont: At your age, you don't have no wild oats, you got shredded wheat.
["Sanford and Son"]
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grow (v.)

Old English growan (of plants) "to flourish, increase, develop, get bigger" (class VII strong verb; past tense greow, past participle growen), from Proto-Germanic *gro- (source also of Old Norse groa "to grow" (of vegetation), Old Frisian groia, Dutch groeien, Old High German gruoen), from PIE root *ghre- "to grow, become green" (see grass). Applied in Middle English to human beings (c. 1300) and animals (early 15c.) and their parts, supplanting Old English weaxan (see wax (v.)) in the general sense of "to increase." Transitive sense "cause to grow" is from 1774. To grow on "gain in the estimation of" is from 1712.

Have you ever heard anything about God, Topsy? ... Do you know who made you?" "Nobody, as I knows on," said the child. ... "I spect I grow'd. Don't think nobody never made me." [Harriet B. Stowe, "Uncle Tom's Cabin," 1851]
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arbor (n.1)

c. 1300, herber, "herb garden, pleasure garden," from Old French erbier "field, meadow; kitchen garden," from Latin herba "grass, herb" (see herb). Later "a grassy plot" (mid-14c., a sense also in Old French), "shaded nook, bower formed by intertwining of trees, shrubs, or vines" (mid-14c.). It is probably not from Latin arbor "tree" (see arbor (n.2)), though perhaps that word has influenced its spelling:

[O]riginally signifying a place for the cultivation of herbs, a pleasure-ground, garden, subsequently applied to the bower or rustic shelter which commonly occupied the most conspicuous situation in the garden ; and thus the etymological reference to herbs being no longer apparent, the spelling was probably accommodated to the notion of being sheltered by trees or shrubs (arbor). [Hensleigh Wedgwood, "A Dictionary of English Etymology," 1859]

But the change from er- to ar- before consonants in Middle English also reflects a pronunciation shift: compare farm from ferme, harbor from Old English herebeorg.

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