1. pathogen-any disease-producing agent (especially a virus or bacterium or other microorganism). microorganism, micro-organism-any organism of microscopic size.infectious agent, infective agent-an agent capable of producing infection. Translations.. pathogen-any disease-producing agent (especially a virus or bacterium or other microorganism). microorganism, micro-organism-any organism of microscopic size.
Agricultural Tools. The Agricultural Tools ClipArt gallery offers 195 illustrations of hand tools such as plows, pitchforks, insecticide sprayers, rakes, and rollers.
1 This tool is used to make holes in leather. 2  A hammer is a simple tool. 3  I always keep a set of tools in the back of my car. 4  Early humans shaped tools out of stone.  Our lawn mower and lots of garden tools were stolen from the shed.