a prefix in loanwords from Greek, where it means “up,” “against,” “back,” “re-”: anabasis; used in the formation of compound words: anacardiaceous.
Also, especially before a vowel, an-.

< Greek, combining form of aná; no necessary relation to on Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
ana- or (before a vowel) an-
1.  up; upwards: anadromous
2.  again: anagram
3.  back; backwards: anatropous
[from Greek ana]
an- or (before a vowel) an-
[from Greek ana]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

prefix meaning 1. "upward," 2. "back, backward, against," 3. "again, anew," from Gk. ana- "up to, toward, exceedingly, back, against," from ana "up, on, upon, throughout, again," cognate with O.E. on, from PIE base *ano- "on, upon, above."
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

ana- pref.

  1. Upward; up: anacrotic.

  2. Backward; back: anaplasia.

  3. Again; anew: anabiosis.

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