Noun: ascidian u'si-dee-un
- Minute sedentary marine invertebrate having a saclike body with siphons through which water enters and leaves
"Clusters of colourful ascidians covered the underwater rock face"
Derived forms: ascidians
Type of: tunicate, urochord, urochordate
Part of: Ascidiaceae, class Ascidiaceae
Encyclopedia: Ascidian