a prefix meaning “through,” “thoroughly,” “utterly,” “very”: pervert; pervade; perfect.
Chemistry. a prefix used in the names of inorganic acids and their salts that possess the maximum amount of the element specified in the base word: percarbonic (H 2 C 2 O 5 ), permanganic (HMnO 4 ), persulfuric (H 2 S 2 O 8 ), acids; potassium permanganate (KMnO 4 ); potassium persulfate (K 2 S 2 O 8 ).

< Latin, combining form of per per, and used as an intensive Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
1.  through: pervade
2.  throughout: perennial
3.  away, beyond: perfidy
4.  completely, throughly: perplex
5.  (intensifier): perfervid
6.  indicating that a chemical compound contains a high proportion of a specified element: peroxide; perchloride
7.  indicating that a chemical element is in a higher than usual state of oxidation: permanganate; perchlorate
8.  (not in technical usage) a variant of peroxy- : persulphuric acid
[from Latin per through]

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Medical Dictionary

per- pref.

  1. Thoroughly; completely; intensely: perfuse.

  2. Containing an element in its highest oxidation state: perchloric acid.

  3. Containing a large or the largest possible proportion of an element: peroxide.

  4. Containing the peroxy group: peracid.

The American Heritage® Stedman's Medical Dictionary
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