Paranoia
early 19th century: modern Latin, from Greek, from paranoos ‘distracted’, from para ‘irregular’ + noos ‘mind’.
wiktionary
Ultimately from Ancient Greek παράνοια(paránoia, “madness”), from παράνοος(paránoos, “demented”), from παρά(pará, “beyond, beside”) + νόος(nóos, “mind, spirit”).
Surface analysis is para-(“abnormal, beyond”) + nous(“mind”) + -ia(“(medical) condition”).
etymonline
paranoia (n.)
"mental disorder characterized by systematized delusions of more or less definite scope," 1848 (earlier paranoea 1811), from Greek paranoia "mental derangement, madness," from paranoos "mentally ill, insane," from para- "beside, beyond" (see para- (1)) + noos "mind," which is of uncertain origin.
FOR several years frequent descriptions have been given in the foreign journals, especially German and Italian, of the forms of insanity designated by the names Paranoia, Verrücktkeit, and Wahnsinn. ["Paranoia — Systematized Delusions and Mental Degenerations," J. Séglas (transl. William Noyes), 1888]
