SEROTINE Meaning of SEROTINE in English [ 'sɛrəti:n ]■ noun a medium-sized insectivorous bat. [ Eptesicus serotinus (Eurasia) and other species.]OriginC18: from Fr. sérotine , from L. serotinus 'of the evening, late'. Concise Oxford English vocab. Сжатый оксфордский словарь английского языка. 2004