hendiadysPronunciation: /hɛnˈdʌɪədɪs/Definition of hendiadys noun [mass noun] the expression of a single idea by two words connected with ‘and’, e.g. nice and warm, when one could be used to modify the other, as in nicely warm. Origin: late 16th century: via medieval Latin from Greek hen dia duoin 'one thing by two'hendiadys in other Oxford dictionaries Definition of hendiadys in the US English dictionary