<p><strong>noun</strong></p><ul><li>an artificially heated greenhouse for the cultivation of tender plants.</li></ul><p><strong>adjective</strong></p><ul><li>of, relating to, or noting a plant grown in a hothouse, or so fragile as to be capable of being grown only in a hothouse.</li><li>overprotected, artificial, or unnaturally delicate.</li></ul>