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amphibian	any cold-blooded vertebrate, such as a frog or salamander, that has aquatic gill-breathing larvae and terrestrial lung-breathing adults. [1/4 definitions]
back	the part of a human or other vertebrate that is on the opposite side from the chest and abdomen and between the neck and the tailbone. [1/15 definitions]
bird	a warm-blooded, egg-laying vertebrate animal with wings and feathers, which usu. has the ability to fly. [1/5 definitions]
chordate	of or denoting an animal, such as a tunicate, lancelet, or vertebrate, that at some stage of development has gill slits, a dorsal nerve cord, and a notochord.
craniate	an animal with a cranium or skull; vertebrate. [1/2 definitions]
cranium	the skull of a vertebrate animal. [1/2 definitions]
ear¹	the organ of hearing in man and vertebrate animals. [1/4 definitions]
foot	in vertebrate animals, the lower part of the leg below the ankle joint, on which the body stands and moves. [1/10 definitions]
forebrain	the anterior of the three divisions of the brain of a vertebrate embryo; prosencephalon. [1/2 definitions]
invertebrate	without a spinal column or backbone; not vertebrate. [1/3 definitions]
mammal	any of the vertebrate animals that feed their babies with milk from the female mammary glands and usu. produce live young, as opposed to laying eggs.
midbrain	the middle of three brain parts in a vertebrate embryo and the part of the adult brain into which this develops; mesencephalon.
naris	one of the outer openings of the vertebrate nose; nostril or nasal passage.
nephridium	the rudiment of an excretory organ of a vertebrate embryo, which later develops into a kidney. [1/2 definitions]
pectoral fin	in fishes, either of a pair of fins situated on the sides behind the head, corresponding to the forelimbs in other vertebrate animals.
pelvic girdle	in a vertebrate, the skeletal structure of bone, cartilage, or both to which the hind legs, fins, or the like are attached; pelvic arch.
radius	one of the two bones of the vertebrate forearm or lower forelimb. (Cf. ulna). [1/7 definitions]
reptile	any of the class of vertebrate cold-blooded animals, including lizards, turtles, snakes, crocodiles, and the like, that breathe with lungs, are covered with scales or hard plates, and have short legs or none at all. [1/4 definitions]
skeleton	the inner framework of bones and cartilage in vertebrate animals, which supports and protects the softer body parts, or the hard external shell of invertebrates and some vertebrates. [1/4 definitions]
spinal column	in vertebrate animals, the row of vertebrae linked together to form the axis of the skeleton and protect the spinal cord; spine; backbone.
spinal cord	the thick cord of nerve tissue that extends through the inner canal of the spinal column from the base of the brain to the end of the spine of any vertebrate animal.

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