A phial is a small glass bottle, usually used to hold liquids like medicine, perfume, or potions. The word sounds old-fashioned because it is: people have been using phials for thousands of years to store precious or powerful liquids in carefully measured amounts.

You might encounter phials in fantasy stories, where wizards keep healing potions or magical elixirs in these tiny bottles. In the real world, pharmacists once stored medicines in phials, and scientists still use them in laboratories to hold chemicals or samples. The small size makes phials perfect for expensive or dangerous substances where you need to control exactly how much you use.

Phials are typically made of glass because glass doesn't react with most liquids and lets you see what's inside. Many have narrow necks and stoppers to prevent spills or evaporation. The word phial is essentially the same as vial (spelled with a v), though phial appears more often in older texts.

When you read about an explorer carrying a phial of antidote or a character clutching a phial of precious liquid, picture something roughly the size of your thumb: small enough to tuck in a pocket, but important enough to protect carefully.