Definition of serotine in US English:

serotine

noun

  • A medium-sized insectivorous bat found in Eurasia and Africa.

    a chiefly Eurasian bat (genus Eptesicus, family Vespertilionidae, in particular the widespread E. serotinus)

    an African bat (genus Pipistrellus, family Vespertilionidae)

    • ‘The Serotine (Eptesicus serotinus) is one of our less common species and is found mainly south of a line from The Wash to parts of South Wales.’
    • ‘In the summer, serotines roost in tree hollows and attics.’

Origin

Late 18th century: from French sérotine, from Latin serotinus ‘of the evening, late’, from serus ‘late’.

Pronunciation