glass

Glass is not only something you drink from. It is also the hard, usually clear material used for windows, bottles, and many other objects. You might notice the clean shine of a window in the sun or the careful shape of a glass sculpture. The word can also mean a single drinking container, like the one you use for water or juice.

This material is often clear, smooth, and shiny, but it also breaks easily. Because of that, the word is sometimes used in a figurative way. If someone has a "heart of glass," they are very sensitive and easy to hurt. If a lake is perfectly still, you might say it looks like glass.

Glass is a hard, brittle, and typically transparent material made by melting sand with other substances. It has been used for millennia—stretching from ancient Egyptian beads to the facades of modern skyscrapers! We most often think of glass as the substance used to make windows, bottles, and drinking vessels. For example: "She raised her glass in a toast."

But "glass" isn't limited to the physical material. It is frequently used to describe things that are delicate or easily broken in an emotional or metaphorical sense. To have a "heart of glass" implies being easily wounded, while a "glass jaw" is a common sports term for someone who cannot take a hit.

The term is also synonymous with extreme smoothness. The phrase "as smooth as glass" describes a surface—or an experience—that is effortless and seamless. Historically, the word was also a common term for a mirror, a usage that survives today in the phrase "looking-glass." In the plural form, "glasses" becomes an essential tool for vision.

Whether you're admiring its transparency, carefully handling its fragility, or enjoying a refreshing drink from a glass, it remains a surprisingly versatile word with a rich history and many layers of meaning.