amphicoelian

== English == === Etymology === From amphi- +‎ Ancient Greek κοῖλος (koîlos, “hollow”) +‎ -ian. === Adjective === amphicoelian (comparative more amphicoelian, superlative most amphicoelian) amphicoelous === References === “amphicoelian”, in Webster’s Revised Unabridged Dictionary, Springfield, Mass.: G. & C. Merriam, 1913, →OCLC.