cœlomata

from The Century Dictionary.

• A term used by E. R. Lankester to cover a second or higher grade or series of Metazoa, including all metazoic animals indiscriminately excepting the sponges and cœlenterates, which constitute a first or lower series of Metazoa called Cœlentera.
• [lowercase] In embryology, the diverticula or buds of the archenteron or primitive stomach, out of which a cœloma is formed after their separation from the archenteron.

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

• noun Plural form of cœloma.