Arachnoid

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Gr. arachne  = spider, and eidos = resemblance. From this root came the Latin term arachnoides = spider-like. Used to describe the coweb-like membrane covering the brain and spinal cord.

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Arenavirus

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L. arena = "sand". Viewed in cross-section, arenaviruses contain grainy particles that are ribosomes acquired from their host cells. It is from this characteristic that they acquired the name arena,…

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Areola

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L. area  = a courtyard or space, and diminiutive suffix –ola. A term used in several ways, but especially applied to the pigmented area around the nipple.

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Artery

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Gr. perhaps from aer = air, and terein  = to keep. This derivation suggests the ancient belief that arteries were windpipes. Adopted into Latin as arteria with the same meaning until the time of Harvey.

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Arytenoid

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Gr. arytaina  = a pitcher, and eidos  = resemblance. The arytenoid cartilages were thought to resemble little pitchers.

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Ascites

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Gr. askos  = a bag or bladder. Applied to a fluid-filled abdomen, often seen in liver cirrhosis.

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Ataxia

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Gr. a  = not, taxis = order, ia  = condition. Applied to a lack of muscular coordination.

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