reservoir
UK: ˈrɛzəvwɑː | US: ˈrɛzərˌvwɑr
n. a natural or artificial place where water is collected and stored for use
n. a large supply or stock of something (e.g., knowledge, talent)
n. (Biology) a part of an organism that stores a substance
The word "reservoir" originates from Old French reservoir (a place to store), derived from Latin reservare ("to keep back, retain"). The morpheme re- (back) combines with servare (to keep), reflecting the idea of holding something in reserve. The suffix -oir (French noun-forming suffix) was added to create a term for a storage place. Over time, it expanded from literal water storage to metaphorical uses (e.g., "reservoir of talent").
The city draws its water supply from a nearby reservoir.
She is a reservoir of creative ideas.
The lake acts as a natural reservoir for rainwater.
Scientists study the body’s fat reservoirs.
The library is a reservoir of historical knowledge.