Bible Encyclopedias
Sigillum Altaris
Cyclopedia of Biblical, Theological and Ecclesiastical Literature
(seal of the altar). "The authentic mark of an altar was its five crosses; and there was a small stone called sigillum altaris, by which the aperture for the insertion of relics was closed up by mortar tempered in holy water" (Fosbrooke).
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Bibliography Information
McClintock, John. Strong, James. Entry for 'Sigillum Altaris'. Cyclopedia of Biblical, Theological and Ecclesiastical Literature. https://www.studylight.org/encyclopedias/eng/tce/s/sigillum-altaris.html. Harper & Brothers. New York. 1870.