As*cid`i*oid"e*a (#), n. pl. [NL., fr. ascidium + -oid. See Ascidium.] Zool.
A group of Tunicata, often shaped like a two-necked bottle. The group includes, social, and compound species. The gill is a netlike structure within the oral aperture. The integument is usually leathery in texture. See Illustration in Appendix.
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© Webster 1913.