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Arthritis Today

Glossary E

Browse the glossary by selecting a letter or by entering an arthritis-related term:

Erosion

A wearing away of the cartilage and bone in the joint caused by inflammation of the joint lining.

Erythrocyte sedimentation rate (sed rate)

A test measuring how fast red blood cells (erythrocytes) clump together and fall to the bottom of a test tube, like sediment falling to the bottom of a glass of water. A high (fast) sedimentation rate signals the presence of inflammation, possibly indicating an inflammatory disease, such as rheumatoid arthritis.

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