Final answer:
The term for an instrument that has been washed but not disinfected or sterilized is 'cleaned'. Cleaning removes visible dirt but does not necessarily eliminate all microbes.
Step-by-step explanation:
The term that refers to an instrument that has been washed but not further treated is cleaned. This indicates that the instrument has been physically cleansed of dirt, blood, and other organic matter but has not undergone disinfection or sterilization. Disinfection is the process that eliminates many or all pathogenic microorganisms on inanimate objects, with the exception of bacterial spores, while sterilization is a process that destroys all forms of microbial life.