• Webster's Revised Unabridged Dictionary
    • n Endostyle (Zoöl) A fold of the endoderm, which projects into the blood cavity of ascidians. See Tunicata.
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Century Dictionary and Cyclopedia
    • n endostyle A longitudinal fold or diverticulum of the middle of the hemal wall of the pharynx of an ascidian, which projects as a vertical ridge into the hemal sinus contained between the endoderm and ectoderm, but remains in free communication with the pharynx by a cleft upon its neural side. From one point of view it appears deceptively as a hollow rod, whence the name. Huxley. See cuts Under Doliolidæ and Tunicata.
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Webster's Revised Unabridged Dictionary
Endo-, + Gr. a pillar