Definition of the term Algae Microorganisms that may grow to colonies in damp environments, including certain rooftops. They can discolor shingles. Often described as “fungus.” Related Posts Definition of the term Aggregate Crushed stone, slag or water-worn gravel that comes in a… Definition of the term Amps (AMPERES) The rate at which electricity flows through a conductor. Definition of the term Architect A tradesman who designs and produces plans for buildings, often…