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Any of a several bats of the genus Eptesicus, especially E. serotinus, of Europe, Asia, and the Middle East.
[From New Latin sērōtinus, specific epithet, from Latin, coming late (from its habit of appearing late in the evening); see serotinous.]
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
(Biology) biology Also: serotinal or serotinous produced, flowering, or developing late in the season
(Animals) either of two insectivorous bats, Eptesicus serotinus or Vespertilio serotinus: family Vespertilionidae
[C16: from Latin sērōtinus late, from sērus late; applied to the bats because they fly late in the evening]
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