| leptocardia | <zoology> The lowest class of Vertebrata, including only the Amphioxus. The heart is represented only by a simple pulsating vessel. The blood is colourless; the brain, renal organs, and limbs are wanting, and the backbone is represented only by a simple, unsegmented notochord. See Amphioxus. Alternative forms: Leptocardii. Origin: NL, fr. Gr. Small + the heart. Source: Websters Dictionary (01 Mar 1998) |
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| leptocardian | <zoology> Of or pertaining to the Leptocardia. One of the Leptocardia. Source: Websters Dictionary (01 Mar 1998) |