Bible Dictionaries
Leptocardia
Webster's Dictionary
(n. pl.) The lowest class of Vertebrata, including only the Amphioxus. The heart is represented only by a simple pulsating vessel. The blood is colorless; the brain, renal organs, and limbs are wanting, and the backbone is represented only by a simple, unsegmented notochord. See Amphioxus.
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Bibliography Information
Webster, Noah. Entry for 'Leptocardia'. Noah Webster's American Dictionary. https://www.studylight.org/dictionaries/eng/web/l/leptocardia.html. 1828.