corallum

From Latin [Term?]. Doublet of coral.

corallum (plural corallums or coralla)

1. (obsolete, zoology) The skeleton of a coral. It can be calcareous or horny, simple or compound.
   • 1878 April, William Emerson Damon, “Popular Science Monthly”, in (Please provide the book title or journal name), Living Corals:

     I am fortunate enough to possess fine specimens of some three or four varieties of living, working coral "polyps," for such is the name by which the coral-builder is designated. These specimens are kept in pure sea-water, and I have studied their habits very carefully for years; they seem to be in perfect health, full of activity, and generally industrious, although I can hardly observe that they have added to their corallum during this period.

• “corallum”, in Webster’s Revised Unabridged Dictionary, Springfield, Mass.: G. & C. Merriam, 1913, →OCLC.