1. (n.) A bed of earth heated by fermenting manure or other substances, and covered with glass, intended for raising early plants, or for nourishing exotics.

2. (n.) A place which favors rapid growth or development; as, a hotbed of sedition.

Hydra birthplace breeding place brooder cloche cold frame conservatory coolhouse cradle forcing forcing bed forcing house forcing pit glasshouse greenhouse hatchery hothouse incubator lathhouse milk cow mustard nest nidus nursery orangery pinery rabbit rich soil rookery seed plot seedbed summerhouse warren