n. Any marine invertebrate of the subphylum Urochordata; the sea squirts
The Century Dictionary and Cyclopedia
Having a urochord, as an ascidian; belonging to the Urochorda.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
n. primitive marine animal having a saclike unsegmented body and a urochord that is conspicuous in the larva
Word Usage
"On the left is a urochordate, an ascidian, a sessile, filter-feeding blob that is anchored to rocks or pilings and sucks in sea water to extract microorganismal meals."