The Collaborative International Dictionary
Coralloid
Coralloid \Cor"al*loid\, a. [L. corallum coral + -oid: cf. F. corallo["i]de.] Having the form of coral; branching like coral.
Wiktionary
coralloid
a. Having the shape or form of coral. n. A small node of calcite, aragonite or gypsum that forms on surfaces in caves, especially limestone caves.