cold frame, in horticulture, sun-heated board frame covered with a removable top of glass or other transparent material and sunk into the ground. The top may be solid or slatted or screened for shade. The cold frame is used to start seedlings in early spring (four to six weeks before the average frost-free date), to harden seedlings or plants removed from greenhouses or hotbeds, and to protect plants during the winter. A hotbed is an artificially heated cold frame.
"cold frame." The Columbia Encyclopedia, 6th ed.. . Encyclopedia.com. (June 21, 2018). http://www.encyclopedia.com/reference/encyclopedias-almanacs-transcripts-and-maps/cold-frame
"cold frame." The Columbia Encyclopedia, 6th ed.. . Retrieved June 21, 2018 from Encyclopedia.com: http://www.encyclopedia.com/reference/encyclopedias-almanacs-transcripts-and-maps/cold-frame
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cold frame • n. a four-sided frame of boards with a removable glass or plastic top. The frame is used to house, protect, and harden off seedlings and small plants, without artificial heat.
"cold frame." The Oxford Pocket Dictionary of Current English. . Encyclopedia.com. (June 21, 2018). http://www.encyclopedia.com/humanities/dictionaries-thesauruses-pictures-and-press-releases/cold-frame
"cold frame." The Oxford Pocket Dictionary of Current English. . Retrieved June 21, 2018 from Encyclopedia.com: http://www.encyclopedia.com/humanities/dictionaries-thesauruses-pictures-and-press-releases/cold-frame