|n. pl.||1.||(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.|
Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.