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joint (adj.)
early 15c., "united or sharing" (in some activity), from Old French jointiz (adj.) "joined together, close together" and Old French joint (14c.), past-participle adjective from joindre "to join, connect, unite," from Latin iungere "to join together," from nasalized form of PIE root *yeug- "to join."
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joint (n.)
c. 1300, "an (anatomical) joint, a part of a body where two bones meet and move in contact with one another, the structure that holds such bones together," from Old French joint "joint of the body" (12c.), from Latin iunctus "united, connected, associated," past participle of iungere "to join together," from nasalized form of PIE root *yeug- "to join." Related: Joints.

In general use from late 14c., of insect and plant parts, also "that which joins two components of an artificial structure." In butchering, "cut of meat on the bone," early 15c. Slang or cant meaning of "place, building, establishment" (especially one where persons meet for shady activities) first recorded 1877; earlier it was used in an Anglo-Irish context (1821), perhaps on the notion of a private side-room, one "joined" to a main room. In late 19c. U.S. use especially "an opium-smoking den" (1883).

Meaning "marijuana cigarette" (1938) is perhaps from notion of something often smoked in common, but there are other possibilities; earlier joint in drug slang meant "hypodermic outfit" (1935). Meaning "prison" is attested from 1953 but probably is older. Out of joint in the figurative sense "disordered, confused, gone wrong" is from early 15c. (literally, of bone displacement, late 14c.). Joint-stock "of or pertaining to holding stock in shares" is from 1610s.
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jointed (adj.)
"provided with joints," early 15c., from joint (n.).
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jointly (adv.)
c. 1300, from joint (adj.) + -ly (2). It seems to have chased out joinly (early 15c.).
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*yeug- 

Proto-Indo-European root meaning "to join."

It forms all or part of: adjoin; adjust; conjoin; conjugal; conjugate; conjugation; conjunct; disjointed; enjoin; injunction; jugular; jostle; joust; join; joinder; joint; jointure; junction; juncture; junta; juxtapose; juxtaposition; rejoin (v.2) "to answer;" rejoinder; subjoin; subjugate; subjugation; subjunctive; syzygy; yoga; yoke; zeugma; zygoma; zygomatic; zygote.

It is the hypothetical source of/evidence for its existence is provided by: Sanskrit yugam "yoke," yunjati "binds, harnesses," yogah "union;" Hittite yugan "yoke;" Greek zygon "yoke," zeugnyanai "to join, unite;" Latin iungere "to join," iugum "yoke;" Old Church Slavonic igo, Old Welsh iou "yoke;" Lithuanian jungas "yoke," jungti "to fasten to a yoke;" Old English geoc "yoke."

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disarticulate (v.)

1808, transitive, "undo the articulation of, separate joint from joint;" see dis- "reverse, opposite of" + articulate (v.). Intransitive sense of "become separated, lose articulation" is by 1830. Related: Disarticulated; disarticulating.

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vertebrate (n.)
"a vertebrate animal," 1826, from Latin vertebratus (Pliny), from vertebra "joint or articulation of the body, joint of the spine" (see vertebra). As an adjective also from 1826.
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coxa (n.)

1706, "hip-joint," from Latin coxa "hip," which, according to de Vaan, is from PIE *koks-h- "limb, joint," and is cognate with Sanskrit kaksa-, Avestan kasa- "armpit," Old Irish coss "foot." As the first joint of the leg of an insect, crustacean or arachnid, by 1826. Cox for "thigh" was used in medical writings from c. 1400. Related: Coxalgia, coxitis.

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arthralgia (n.)
"pain in a joint," 1848, earlier in French and German, from Greek arthron "joint" (from PIE root *ar- "to fit together") + -algia "pain." Related: Arthralgic.
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weld (n.2)
"joint formed by welding," 1831, from weld (v.).
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