articleyoudaoicibaDictYouDict[article 词源字典]
article: [13] Like art, arm, and arthritis, article goes back to an Indo-European root *ar-, which meant ‘put things together, join, fit’. Amongst its derivatives was Latin artus ‘joint’ (a form parallel to Greek árthron, source of arthritis), of which the diminutive was articulus ‘small joint’. This was extended metaphorically to mean ‘division, part’, and when the word first entered English, via Old French article, it was used for a particular clause of a treaty, of a contract, or specifically of the Creed.

Its application to an ‘item, thing’ is a comparatively late development, from the start of the 19th century. A Latin derivative of articulus, the verb articulāre ‘divide into joints’, hence ‘speak distinctly’, gave rise to English articulate [16].
=> arm, art, arthritis[article etymology, article origin, 英语词源]
article (n.)youdaoicibaDictYouDict
c. 1200, "separate parts of anything written" (such as the statements in the Apostles' Creed, the clauses of a statute or contract), from Old French article (13c.), from Latin articulus, diminutive of artus "a joint" (from PIE *ar-tu-, from *ar- "to fit together;" (see arm (n.1)).

Meaning extended to "a small division," then generalized to "item, thing." Older sense preserved in Articles of War "military regulations" (1716) and Articles of Confederation (U.S. history). Meaning "literary composition in a journal, etc." (independent, but part of a larger work) first recorded 1712. Meaning "piece of property" (clothing, etc.) first attested 1796, originally in rogue's cant.