enantio- +

(Greek: opposite, opposing, over against; [en- + anti])

enantiobiosis
The condition in which organisms living together antagonize one another's development.
enantiodromia
1. The changing of something into its opposite.
2. A concept introduced by psychiatrist Carl Jung meaning the superabundance of any force inevitably produces its opposite.
enantiodromic
Characteristic of something which has become its opposite.
enantiomer
One of a pair of compounds having a mirror image relationship.
enantiomorph
A form which is related to another as an object is related to its image in a mirror; a mirror image.
enantiomorphism
The condition or property of being enantiomorphous.
enantiopathy (s) (noun) (no pl)
A treatment of an illness with cures that produce results different from those that were produced by the illness itself; allopathy: Enantiopathy is an expression used by followers of Hahnemann or homeopathists.
enantiosis
1. A figure of speech by which what is to be understood affirmatively is stated negatively, and the contrary.
2. The rhetorical device of stating the opposite of what is meant, usually ironically; affirmation by contraries.
3. A figure of speech in which what is meant is the opposite of what is said; irony.