from The Century Dictionary.

  • A division of tunicates, containing the free-swimming forms, or the salps and doliolids: distinguished from Ascidiacea. Also Thaliæ, Thaliadæ, Thalida, Thalides.

from the GNU version of the Collaborative International Dictionary of English.

  • noun plural (Zoöl.) A division of Tunicata comprising the free-swimming species, such as Salpa and Doliolum.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • noun small class of free-swimming tunicates; sometimes classified as an order


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