Definitions

from The Century Dictionary.

  • noun That larval form of various annelids, mollusks, and mulluscoids which has a circlet of cilia.

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

  • noun (Zoöl.) A young larval form of many annelids, mollusks, and bryozoans, in which a circle of cilia is developed around the anterior end.

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

  • noun zoology A young larval form of many annelids, mollusks, and bryozoans, in which a circle of cilia is developed around the anterior end.

Etymologies

from Wiktionary, Creative Commons Attribution/Share-Alike License

Ancient Greek a wheel + sphere.

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