"Junkyard" means any lot, or the use of any portion of a lot, for the dismantling or wrecking of automobiles or other motor vehicles or machinery, or for the storage or keeping for sale of parts and equipment resulting from such dismantling or wrecking, or for the storage or keeping of junk, including scrap metals or other scrap materials. (Ord. 1000 § 6.20, 1955)