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ad- pref. repr. L. ad (see AT) to express motion to, direction towards, etc., as advenīre arrive, adversus ADVERSE; the d was assim. to following c, f, g, l, n, q, r, s, t, producing AC-, AF-, etc.; ad- was reduced to a- before sc, sp, st (e.g. ASCEND, ASPIRE, ASTRINGENT) and gn (as in AGNATE). In OF. the double cons. of acc-, add-, agg-, etc. were reduced to single ones, and adv- became av-, and OF. words were adopted with such forms in Eng.; but in XIV these began to be latinized (as some had been in French) by the resumption of the second cons., as in address, allow, arrest.

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T. F. HOAD. "ad-." The Concise Oxford Dictionary of English Etymology. 1996. Encyclopedia.com. 10 Feb. 2012 <http://www.encyclopedia.com>.

T. F. HOAD. "ad-." The Concise Oxford Dictionary of English Etymology. 1996. Encyclopedia.com. (February 10, 2012). http://www.encyclopedia.com/doc/1O27-ad.html

T. F. HOAD. "ad-." The Concise Oxford Dictionary of English Etymology. 1996. Retrieved February 10, 2012 from Encyclopedia.com: http://www.encyclopedia.com/doc/1O27-ad.html

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ad-

ad- prefix denoting towards or near.

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"ad-." A Dictionary of Nursing. 2008. Encyclopedia.com. 10 Feb. 2012 <http://www.encyclopedia.com>.

"ad-." A Dictionary of Nursing. 2008. Encyclopedia.com. (February 10, 2012). http://www.encyclopedia.com/doc/1O62-ad.html

"ad-." A Dictionary of Nursing. 2008. Retrieved February 10, 2012 from Encyclopedia.com: http://www.encyclopedia.com/doc/1O62-ad.html

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