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Cyclopedia of Biblical, Theological and Ecclesiastical Literature
(a little shade), an altar canopy, more generally called the ciborium (q.v.).
These files are public domain.
McClintock, John. Strong, James. Entry for 'Umbraculum'. Cyclopedia of Biblical, Theological and Ecclesiastical Literature. https://www.studylight.org/encyclopedias/eng/tce/u/umbraculum.html. Harper & Brothers. New York. 1870.