Meaning of “cold frame” in the English Dictionary

british dictionary

"cold frame" in British English

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cold framenoun [ C ]

uk /ˈkəʊld ˌfreɪm/ us /ˈkoʊld ˌfreɪm/

a glass or plastic box, with a top that can be left open, into which young plants are put for a short time, especially in order to help them grow faster or to protect them from cold weather

(Definition of “cold frame” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)