ascidian

as·cid·i·an

 (ə-sĭd′ē-ən)

n.

See sea squirt.

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[From New Latin Ascidia, genus name, from Greek askidion, diminutive of askos, wineskin.]

American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

ascidian

(əˈsɪdɪən)

n

1. (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)

2. (Zoology) ascidian tadpole the free-swimming larva of an ascidian, having a tadpole-like tail containing the notochord and nerve cord

adj

(Zoology) of, relating to, or belonging to the Ascidiacea

Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014

as•cid•i•an

(əˈsɪd i ən)

n.

1. any tunicate of the class Ascidiacea, having in the larval stage a notochord, a characteristic of the embryonic vertebrate.

adj.

2. belonging or pertaining to the class Ascidiacea.

[1855–60; < New Latin Ascidi(um) a tunicate genus < Greek askídion a small bag + -an¹]

Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.

Thesaurus

Noun

1.

ascidian - minute sedentary marine invertebrate having a saclike body with siphons through which water enters and leaves tunicate, 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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