Posted on 1st February 2012 by melyn Onyon is the Cornish word for onions Yes, onions in Cornish is onyon Share this:Click to share on Twitter (Opens in new window)Click to share on Facebook (Opens in new window) Related Post navigationPrevious post: Plommwedhek is the Cornish word for verticalNext post: Sononieth is the Cornish word for acoustics