hysteron proteron hys·te·ronp·roteron uncommon noun 1. reversal of normal order of two words or sentences etc. (as in `bred and born'') Synonymshysteron proteron 2. the logical fallacy of using as a true premise a proposition that is yet to be proved Synonymshysteron proteron Related words Broader terms logical fallacyrhetorical device WordNet 2.1 (Princeton University). WordNet 2.1 Copyright Princeton University. All rights reserved.