cold roomn.Horticulture a store-room kept at a very low temperature for the retardation of bulbs and roots.
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cold room1904
1904 Westm. Gaz. 12 Jan. 4/2 In some of the largest nurseries..there exist cold-rooms or stores, pitch-dark and packed full of lily-of-the-valley crowns, lilies, and other bulbs and plants.