cold-frame

cold frame

noun
a bottomless, boxlike structure, usually covered with glass or transparent plastic, and the bed of earth that it covers, used to protect plants.

Origin:
1850–55

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
cold frame
 
n
an unheated wooden frame with a glass top, used to protect young plants from the cold

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