Definitions for op-ed
Random House Webster's College Dictionary
a newspaper page or section devoted to signed articles by commentators, essayists, etc., and sometimes to letters from readers.
Origin of Op-Ed:
1965–70, Amer.; op(posite)ed(itorial page)
A newspaper page containing signed articles by commentators expressing viewpoints that may not agree with those espoused by the editorial board, traditionally printed opposite the editorial page.
Of or being a newspaper page, usually opposite the editorial page, that features signed articles expressing personal viewpoints.
Of an article, written in a style suitable for publication as an op-ed.
Origin: Abbreviation for “opposite the editorial” (often incorrectly thought to be abbreviation for opinion/editorial).