In 1934, the philologist A. S. C. Ross wrote a review of the 1933 Oxford English Dictionary Supplement (Neuphilologische Mitteilungen 35: 128-132) in which he referred to taboo words as "mumfordish" vocabulary. He used the same word again in the same year in a short note in Transactions of the Philological Society (volume 33, issue 1, page 99), and again made it clear that for him it was a synonym for "taboo" or "obscene" as applied to lexical items. Charlotte Brewer of Oxford University, an expert on the history of the OED (author of Treasure-house of the Language: The Living OED and creator of the marvellous Examining the OED website), mentioned in a paper presented at the ISLE-1 conference in Freiburg last week that she was baffled by the word mumfordish. So am I. Can any Language Log reader shed serious (rather than speculative) light on its etymology? Comments are open.