treasure house

or treas·ure-house


noun

a building, room, or chamber used as a storage place for valuables; treasury.
a place or source where things of value or worth may be found: Books are the treasure house of ideas.

Origin of treasure house

late Middle English word dating back to 1425–75
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

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