In medical terms, an agent usually refers to a medication. For instance, an antihypertensive agent reduces blood pressure.
An antineoplastic agent is one that works against tumors. A tumor is also known in medical terms as a neoplasm.
pathogenAn agent of infection is a pathogen.
A cytotoxin is an agent that kills cells
Crescendo in medical terms has the same meaning as in musical terms: an increase in sound volume over time.
A teratogen is an agent that causes birth defects.
Small has the same meaning in medical and common language.
A carcinogen is an agent that causes cancer.
An antimotility agent controls loose stools.
Orthostasis is the act of standing upright
The medical terminology combining form -cidal is an adjectival suffix meaning "killing." For instance, a fungicidal agent kills fungus, and a virucidal agent kills viruses.
Color has the same meaning in medical and common usage.
Inception or onset means beginning in medical terms.