[ ahr-kee-oh-sahy-uh-thid, ahr-kee-uh- ]
/ ˌɑr ki oʊˈsaɪ ə θɪd, ɑrˌki ə- /


one of the marine invertebrates of the extinct phylum Archaeocyatha, widely distributed during the Cambrian Period, having a limy, typically conical or cylindrical skeleton composed of sievelike inner and outer walls.

Origin of Archaeocyathid

< New Latin Archaeocyath(us) genus name (archaeo- archaeo- + Latin cyathus ladle < Greek kýathos) + -id2 Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020