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apo-

 
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a prefix occurring originally in loanwords from Greek, where it was joined to verbs, deverbal forms, and other parts of speech. Among its functions in Greek, apo- has the spatial sense “away, off, apart” (apogee; apocope; apostasy; apostrophe); it occurs with deverbals that denote a response or defense (apodosis; apology) and is found on verbs having perfective force relative to a corresponding simple verb (apoplexy; aposiopesis). In modern scientific coinages in English and other languages, apo- marks things that are detached, separate, or derivative (apocarpous; apoenzyme).
Also, especially before a vowel, ap-.

Origin:
< Gk, prefixal use of apó; akin to off, Skt apa, L ab
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
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apo- or ap-  
pref.  
    1. Away from; off: aphelion.
    2. Separate: apocarpous.
  2. Without; not: apogamy.
  3. Related to; derived from: apomorphine.
  4. Metasomatic: apophyllite.

[Greek, from apo, away from; see apo- in Indo-European roots.]
The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2009 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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apo- 
prefix meaning "from, away from, separate," from Gk. apo, from PIE base *apo- "off, away" (cf. Skt. apa "away from," Avestan apa "away from," L. ab "away from, from," Goth. af, O.E. of "away from").
Online Etymology Dictionary, © 2001 Douglas Harper
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apo- or ap-
pref.

  1. Away from; off: aponeurosis.
  2. Separate: apocrine.
  3. Without; lacking; not: apoferritin.
  4. Related to; derived from: apomorphine.

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