scaffoldyoudaoicibaDictYouDict[scaffold 词源字典]
scaffold: [14] Historically, scaffold and catafalque [17] ‘coffin-stand’ are virtually the same word. Catafalque comes via French catafalque and Italian catafalco from Vulgar Latin *catafalcum, a word of uncertain origin. Combination with the prefix ex- produced *excatafalcum, which passed into English via Old French eschaffaut and Anglo-Norman *scaffaut.

The word originally denoted any sort of platform, and did not narrow down to ‘platform for executions’ until the 16th century. The derivative scaffolding, a term which originally alluded to the platforms set up around a building rather than to poles supporting them, also dates from the 14th century.
=> catafalque[scaffold etymology, scaffold origin, 英语词源]
scaffold (n.)youdaoicibaDictYouDict
mid-14c., "wooden framework used in building, etc., temporary structure for workmen to make walls," a shortening of an Old North French variant of Old French eschafaut "scaffold" (Modern French échafaud), probably altered (by influence of eschace "a prop, support") from chaffaut, from Vulgar Latin *catafalicum (see catafalque). Meaning "platform for a hanging" is from 1550s. Dutch schavot, German Schafott, Danish skafot are from French. As a verb from 1540s.