thigh bone
US /ˈθaɪ boʊn/
UK /ˈθaɪ boʊn/

1.
the longest and thickest bone of the human skeleton, extending from the pelvis to the knee
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The doctor examined the patient's broken thigh bone.
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The femur is also known as the thigh bone.
the longest and thickest bone of the human skeleton, extending from the pelvis to the knee