greenhouse

A greenhouse is a building, usually made of glass or clear plastic, where plants are grown in a warm and protected space. It lets in sunlight and helps keep the inside suitable for flowers, vegetables, and young plants, even when the weather outside is too cold or windy.

You might see one at a botanical garden full of rare plants, or in someone's backyard where seedlings are started before they are moved outdoors. The word usually refers to the structure itself and the safe growing conditions it provides.

A greenhouse is a structure with walls and roof made chiefly of transparent material—like glass or plastic—used for growing plants. It creates a controlled environment that protects plants from harsh weather, pests, and diseases while maximizing sunlight exposure. Think of it as a cozy haven where plants can thrive regardless of the season.

Historically, greenhouses were often attached to estates, allowing wealthy families to enjoy exotic fruits and flowers year-round. Today, they range from small backyard structures for home gardeners to massive commercial facilities that supply produce to entire regions.

Most of the time, the word simply means the plant-growing structure. In some cases, though, people use it metaphorically for a place or situation that helps something develop. For example, a supportive school might be called a greenhouse for young talent.

The word also appears in the phrase "greenhouse effect," which is related to heat being trapped in Earth's atmosphere by certain gases. That phrase is connected to climate science, but the basic meaning of greenhouse is still the glass or plastic building where plants are grown.

In everyday English, though, the image is simple: a bright, sheltered place where plants are given the right conditions to grow.