[Solved] Resistance in a circuit may be measured using an ammeter. Colony: A distinct group of microorganisms, visible with the naked eye, on the surface of a culture medium. Mordant: A substance used in dyeing and printing that fixes the dye in the fabric, improving colorfastness; or, when used figuratively, it describes a sharply caustic or incisive expression. KOH Mount: A laboratory technique used to diagnose fungal infections, involving the application of potassium hydroxide to a sample to clear the material and make fungi more visible under a microscope. Tuberculosis: A contagious bacterial infection that primarily impacts the lungs but can also affect other parts of the body.