sclerobase

from The Century Dictionary.

• noun A dense corneous or calcareous mass into which the axial part of the cœnosarc of a compound actinozoan may be converted, as it is in the red coral of commerce, for example. See cut under Coralligena.

from the GNU version of the Collaborative International Dictionary of English.

• noun (Zoöl.) The calcareous or hornlike coral forming the central stem or axis of most compound alcyonarians; -- called also foot secretion. See Illust. under gorgoniacea, and cœnenchyma.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun zoology The calcareous or hornlike coral forming the central stem or axis of most compound alcyonarians.