ολημερίς

Translation: all day long; throughout the day (adverb)

Etymology: Derived from Ancient Greek ὅλος (holos) meaning 'whole, entire' and ἡμέρα (hēmera) meaning 'day'. The suffix -ίς is an adverbial ending. The word literally means 'during the whole day'. English cognates include 'holistic' (from ὅλος) and words containing 'hemer-' like 'ephemeral' (from ἡμέρα).