Definition of transitional fossil
: a fossil that exhibits characteristics of both ancestral and derived forms During the past 30 years, new discoveries and reinvestigations of long-forgotten specimens have coalesced into a flood of transitional fossils. Paleontologists have unearthed walking whales from Pakistan, feathered dinosaurs from China … — Courier News (Bridgewater, New Jersey), 27 Feb. 2011 However, although the mammal and bird origins are both documented by numerous transitional fossils, turtles appear abruptly. — Michael S. Y. Lee, Science, 24 Sept. 1993
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First Known Use of transitional fossil
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