'Baldachin' definitions:

Definition of 'baldachin'

noun

Ornamented canopy supported by columns or suspended from a roof or projected from a wall (as over an altar)

From: GCIDE

Baldachin \Bal"da*chin\, n. [LL. baldachinus, baldechinus, a canopy of rich silk carried over the host; fr. Bagdad, It. Baldacco, a city in Turkish Asia from whence these rich silks came: cf. It. baldacchino. Cf. Baudekin.]
1. A rich brocade; baudekin. [Obs.] [1913 Webster]
2. (Arch.) A structure in form of a canopy, sometimes supported by columns, and sometimes suspended from the roof or projecting from the wall; generally placed over an altar; as, the baldachin in St. Peter's. [1913 Webster]
3. A portable canopy borne over shrines, etc., in procession. [1913 Webster] [Written also baldachino, baldaquin, etc.] [1913 Webster]