Is it "chaises longues" or just "chaise longues"? Both examples exist in different dictionaries. Or should it be something else entirely?
closed as general reference by Alenanno, Thursagen, Robusto, Callithumpian, kiamlaluno Jun 9 '11 at 19:40
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The French plural is chaises longues, although neither pluralizing 's' would be pronounced in French. I can't imagine anybody pronouncing chaises with two 's's. The default rule in English, to add an 's', produces chaise longues. Google Ngrams shows both spellings are quite common.
So I'd say both spellings are acceptable. For pronunciation, I can't imagine saying anything but "shays longs". However, Oxford says the plural is pronounced the same as the singular, and Merriam-Webster says both shays longs and shays long are correct, so I suppose there are two correct pronunciations, as well.