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]