daylong adjective 1adverb 1 adjective1 •Which lasts a day, or approximately so.The Hang En tour involves a difficult daylong trek over limestone mountain paths and along riverbeds to the remote indigenous village of Ban Doong. — 2014 adverb1 •Throughout the day.I feel myself to be a man disgraced, walking nightlong and daylong beyond the Paling of a Garden lush with fountains and flowers, waiting In vain for the.... — 1988
