One of those Newton's Apple-type trivia bits I tend to trot out with reasonable frequency (and have for as long as I can remember, practically) is that glass is "supercooled liquid". Now Garret points me to this article which actually shows us that I was ill-informed:
When glass is made, the material (often containing silica) is quickly cooled from its liquid state but does not solidify when its temperature drops below its melting point. At this stage, the material is a supercooled liquid, an intermediate state between liquid and glass. To become an amorphous solid, the material is cooled further, below the glass-transition temperature. Past this point, the molecular movement of the material's atoms has slowed to nearly a stop and the material is now a glass. This new structure is not as organized as a crystal, because it did not freeze, but it is more organized than a liquid. For practical purposes, such as holding a drink, glass is like a solid, Ediger says, although a disorganized one.
Good enough. Lesson learned and all that.