‖n. pl. [ NL., fr. Gr. lepto`s small + kardi`a the heart. ] (Zool.) 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. [ Written also Leptocardii. ] [ 1913 Webster ]
n. [ Gr. lepto`s small, thin + da`ktylos finger, toe. ] (Zool.) A bird or other animal having slender toes. [ Written also lepodactyle. ] [ 1913 Webster ]
n. [ See leptodactyl. ] A natural family of New World frogs; in some classifications it is essentially coextensive with the family Bufonidae. Syn. -- family Leptodactylidae. [ WordNet 1.5 ]
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