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amphicoelous

adjective
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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First Known Use of amphicoelous

1866, in the meaning defined above

History and Etymology for amphicoelous

Late Greek amphikoilos doubly concave, from Greek amphi- + koilos hollow

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The first known use of amphicoelous was in 1866

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