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Definition of Ad-

Ad-: Latin prefix meaning "toward" and "in the direction of," as in adduction (movement of a limb toward the midline of the body), adhesion, and adrenal (toward the kidney).

Source: MedTerms™ Medical Dictionary
http://www.medterms.com/script/main/art.asp?articlekey=6579
Last Editorial Review: 11/15/2003

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