catabasion

== English == === Alternative forms === katabasion === Etymology === From Ancient Greek καταβάσιον (katabásion, “a way down”), from κατάβασις (katábasis). === Noun === catabasion (plural catabasia) (architecture, religion) A vault under the altar of a Greek church. === References === “catabasion”, in Webster’s Revised Unabridged Dictionary, Springfield, Mass.: G. & C. Merriam, 1913, →OCLC.