Kvetch means to complain habitually, whine; gripe. It also refers to a chronic complainer and a complaint.

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Kwashiorkor refers to a growth-retarding disease affecting children who receive enough calories but little if any protein.

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Kyphosis is increased anterior concavity of the normal thoracic curve. The lumbar spine may have a reduction of its normal lordotic curve, resulting in a flat-back appearance referred to as Lumbar Kyphosis.

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