ascidian

[uh-sid-ee-uh n]Zoology
noun
  1. any solitary or colonial tunicate of the class Ascidiacea, exhibiting in the larval stage the vertebrate characteristics of a notocord and hollow nerve cord.
adjective
  1. belonging or pertaining to the class Ascidiacea.

Origin of ascidian

1855–60; < New Latin Ascidi(um) a tunicate genus (see ascidium) + -an
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for ascidian

ascidian

noun
  1. 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)
  2. ascidian tadpole the free-swimming larva of an ascidian, having a tadpole-like tail containing the notochord and nerve cord
adjective
  1. of, relating to, or belonging to the Ascidiacea
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