Rat Control: Definitions. Unless the context otherwise requires, the following definitions apply in this article: (a) “Dock” means a platform built on the shore or out from the shore, and is used by ships for loading and unloading of cargo or passengers. (b) “Docking lines” means those lines that stretch from a ship or vessel to a dock, wharf, or pier, and are used to hold vessels in place alongside a dock, wharf, or pier. (c) “Rat guards” means a circular disc made of tin, wood, plastic, glass, aluminum or other material that is placed around the docking lines of a vessel so as to prevent rats from crawling onto or off the vessel to the dock. (d) “Vessels” mean large boats or ships designed or equipped for conveying passengers or cargo. Source: MIDC § 9.12.010.