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Etymology — The origins of English words

Where do words come from? Trace the origin and history of any English word, from its Latin, Greek or Old English roots through to its modern meaning. Every etymology is sourced.

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furnace
Latin
From Old French fornais, from Latin fornax, meaning "oven" or "kiln."
flue
Old English
Origin uncertain, first recorded in Middle English; possibly linked to an Old English word for "flow."
flu
Italian
A shortened form of "influenza," itself borrowed from Italian.
parachute
French
From French parachute, combining para- ("protection against") and chute ("fall").
standoff
Origin
Formed from the phrasal verb "stand off," turned into a single noun.
bagel
German
Borrowed from Yiddish beygl, ultimately traced back to a Middle High German word meaning "ring" or "bracelet," which describes the bread's distinctive round shape.
effigy
Latin
From Latin effigies, "likeness," from effingere, "to fashion" or "portray."
mail
Latin
The postal sense comes from Old French male ("bag, wallet"), from a Frankish word for a bag used to carry letters. The armor sense is unrelated, from Old French maille, ultimately from Latin macula ("mesh, spot").
tangent
Latin
From Latin tangens ("touching"), the present participle of tangere ("to touch").
sine
Latin
From Latin sinus ("curve, fold, bosom"), which was actually a mistranslation — Arabic mathematicians used a word meaning "sine" that looked, unvowelled, like their word for "bosom," and Latin translators picked the wrong meaning.
algebra
Arabic · 800
From Arabic al-jabr ("reunion of broken parts"), taken from the title of a ninth-century mathematics text by al-Khwarizmi.
calculus
Latin
From Latin calculus, "small pebble," the same word used for counting stones on an abacus — mathematicians later borrowed it for this branch of math.
lemonade
French
From French limonade, built from lemon plus the suffix -ade (as in orangeade).
phalanx
Greek
From Greek phalanx, "battle order, line of soldiers" — later borrowed by anatomists for the similarly lined-up finger bones.
furtive
Latin
From Latin furtivus ("stolen, secret, hidden"), from furtum ("theft"), from fur ("thief").
nefarious
Latin
From Latin nefarius, "wicked" — built from ne- ("not") and fas ("what is right in the eyes of the gods").
transcendent
Latin
From "transcend" plus "-ent," or borrowed directly from Latin "transcendens."
aphasia
Greek
From Greek aphasia, "speechlessness," from a- ("not") plus phasis ("speech").
operation
Latin
From Latin operatio, "a working," from the verb operari — the same root as "operate."
pair
Latin
From Middle English paire, via Old French from Latin paria, "equal things," related to par, "equal."
rectangle
Medieval Latin
From Medieval Latin rectangulum, from Latin rectus ("right, straight") plus angulus ("angle").
rust
Old English
From Old English rust, going back to a very old Germanic root meaning "red" — the same root that gives us the word "red" itself.
voltage
Origin
From volt + the noun-forming suffix -age, ultimately honoring Alessandro Volta, inventor of the battery.
intersection
Latin
From Latin intersectio, from intersecare, "to cut between."