as·cid·i·an ( -s d  -n)n. See sea squirt. [From New Latin Ascidia, genus name, from Greek askidion, diminutive of askos, wineskin.] |
ascidian [əˈsɪdɪən]
n
1. (Life Sciences & Allied Applications / Zoology) any minute marine invertebrate animal of the class Ascidiacea, such as the sea squirt, the adults of which are degenerate and sedentary: subphylum Tunicata (tunicates)
(Life Sciences & Allied Applications / Zoology)
ascidian tadpole the free-swimming larva of an ascidian, having a tadpole-like tail containing the notochord and nerve cord
adj
(Life Sciences & Allied Applications / Zoology) of, relating to, or belonging to the Ascidiacea
ThesaurusLegend: Synonyms Related Words Antonyms
| Noun | 1. |  ascidian - minute sedentary marine invertebrate having a saclike body with siphons through which water enters and leavestunicate, urochord, urochordate - primitive marine animal having a saclike unsegmented body and a urochord that is conspicuous in the larva Ascidiaceae, class Ascidiaceae - sometimes classified as an order: sea squirts sea squirt - ascidian that can contract its body and eject streams of water |
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