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ap-1

1.
variant of ad- before p: appear.

ap-2

1.
variant of apo- before a vowel or h: aphelion.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for ap-

ap-

prefix
1.
a variant of apo- aphelion

apo-

prefix
1.
away from; off: apogee
2.
indicating separation of: apocarpous
3.
indicating a lack or absence of: apogamy
4.
indicating derivation from or relationship to: apomorphine
Word Origin
from Greek apo away, off
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for ap-

form of Latin ad- before words beginning in -p-; see ad-.

patronymic prefix in Welsh names, earlier map "son," cognate with Gaelic mac. Since 17c. merged into surnames (Ap Rhys = Price, Ap Evan = Bevan, etc.).

It is said that a Welshman who evidently was not willing to be surpassed in length of pedigree, when making out his genealogical tree, wrote near the middle of his long array of 'aps' -- "about this time Adam was born." ["Origin and Significance of our Names," "The Chautauquan," Oct. 1887-July 1888]

Online Etymology Dictionary, © 2010 Douglas Harper
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ap- in Medicine

ap- 1
pref.
Variant of ad-.

ap- 2
pref.
Variant of apo-.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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