simple past tense and past participle of retroact

(intransitive) To utter the interjection oh; to express surprise, etc.

An inflammatory and satirical remark of, or characteristic of, Henry Louis H. L. Mencken (1880–1956), influential American writer and critic.

A field of military technology dealing with electronic weapons or devices used to either degrade or enhance human health by directed energy. / Synonym of parapsychology