On 28/08/2020 15:04, Richard Tobin wrote:
In article ,
Mike wrote:

C.OED supports "fetid" (although I suppose "foetid" might suffice, if
it's good enough for Hellebores ...

From Latin "fetidus" (often incorrectly written foetidus) - OED

The Greek original was "φουτιδ". The Romans probably changed it to avoid
the "ου"(oe). It still appears in words like "Asafoetida".

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Jeff