Ciborium
Ciborium , noun
[Late Latin, from Latin ciborium a cup, from Greek {not transcribed} a seed vessel of the Egyptian bean; also, a cup made from its largeleaves, or resembling its seed vessel in shape.]
1.
(Architecture) A canopy usually standing free and supported on four columns, covering the high altar, or, very rarely, a secondary altar.
2.
(Roman Catholic Church) The coffer or case in which the host is kept; the pyx.