Vivisector

Part of speech: noun

Definitions

1. A professional who conducts invasive procedures on living creatures to investigate biological functions
2. An individual performing surgical interventions on live animals to acquire knowledge regarding their bodily processes
3. A person who engages in the practice of performing experiments or surgical operations on live organisms to learn about their physiological and anatomical characteristics

Etymology: "Vivisector" is built from "vivisect" plus the agent suffix "-or", so it names a person who carries out vivisection. The base verb "vivisect" is itself a back-formation from "vivisection", the older noun. The "-or" ending arrived in English through Old French, where it descended from Latin "-or" and "-ator" forms (the Latin suffix that names the one who performs an action), and it reached Middle English as "-our" before settling into the modern spelling. The suffix is far older than the word it sits on. Its distant ancestry lies in Proto-Indo-European "*-tōr", which passed into Proto-Italic and then into Latin, so the "-or" in "vivisector" is a piece of the same grammatical machinery that produced "actor", "doctor" and "governor". What makes this word distinctive is that its first half, "vivi-", is the Latin for "living", so the whole term literally describes someone who cuts into the living.