Ascidioidea :: Ascidioidea (n. pl.) 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..
Cardioid :: Cardioid (n.) An algebraic curve, so called from its resemblance to a heart..
Cardioinhibitory :: Cardioinhibitory (a.) Checking or arresting the heart's action.