1. Artery: Any of the muscular-walled tubes forming part of the circulation system by which blood is conveyed from the heart to all parts of the body.
Noun: A muscular spasm in the coronary artery can cause a heart attack.
2. Bone: Any of the pieces of hard whitish tissue making up the skeleton in humans and other vertebrates.
Noun: A good dog deserves a good bone.
3. Brain: An organ of soft nervous tissue contained in the skull of vertebrates, functioning as the coordinating center of sensation and intellectual and nervous activity.
Noun: We learnt about the structure of the brain today.
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