Integument

Part of speech: noun

Pronunciation: /ɪnˈtɛɡ.jʊ.mənt/

Definitions

1. A protective layer surrounding an organism, which serves to guard internal structures while also playing a role in sensation and interaction with the environment
2. The outermost covering of a living being, functioning to shield the body from external factors and contributing to sensory and physiological processes
3. A biological covering that envelops an organism, providing protection against environmental hazards while also participating in sensory and regulatory functions

Etymology: Latin "integumentum" meant simply "a covering," built from "integere," "to cover over," which combined "in-" (here meaning "over" or "upon") with "tegere," "to cover." That same "tegere" root turns up in "tegument," "detect" (literally "to uncover"), and "protect" (to cover in front), so "integument" sits in a family of words all about putting something over something else. English borrowed the Latin word directly, and its use stayed close to that original sense for centuries: anything that wraps or clothes a thing. Biologists later narrowed it to the skin, shell, or husk that encloses an organism or one of its parts, so the term now describes a living body's outer layer rather than any cloak or covering in general.

Synonyms: covering, skin, envelope, sheath, membrane