well there you go Liz, another word that has lost its original meaning here in north America, when I checked my "English" dictionary, "corn" was given as a generic term for any grain and depending on the locality could refer to oats, barley, wheat or in North America, Indian corn. I've never heard the word corn (rarely maize or Indian corn) used here to refer to a grain other than corn and we be a "wheat country".
Gee, and here I thought that St. Brendan and Eric the Red might have been doing a lot more travelling than we suspected.
Still doesn't explain the "corn" carved on the church in Edinburgh, as pointed out to my daughter by local guides. My daughter took a picture of it, looks like corn to me too, not any other grain, of course it could have been done by a really bad artist.