Definitions from Wiktionary ( )

▸ noun:  A low bed of earth covered with glass, and heated with rotting manure, used for the germination of seeds and the growth of tender plants, like a miniature hothouse.
▸ noun:  (by extension) An environment that is ideal for the growth or development of something, especially of something undesirable.
▸ noun:  An iron platform in a rolling mill, on which hot bars, rails, etc., are laid to cool.

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