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.
The chapter describes the tools and weapons used by Native Americans in the Southeastern part of North America. In the Southeastern part of the continent, farming was important. Men and women both worked in the fields. They used tools called mattocks. A mattock is a digging tool similar to a pick.