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am·phi·coe·lous
variants:
or less commonly amphicelous or amphycoelous \ -¦sēləs \
Definition of amphicoelous
: biconcave —used of vertebrae (as those of certain reptiles) having both the anterior and posterior surfaces of the centrum concave
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Time Traveler for amphicoelous
The first known use of amphicoelous was in 1866
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