Squill, a perennial herb native to Mediterranean regions. The plant is also called sea onion. The squill grows to a height of 18 inches (45 cm) and has long, pointed leaves. The tiny white, rose, or yellow flowers are borne in spikes. The white or red bulbs of some varieties are ground into a powder that is used in various products. A white-bulb variety yields a substance used in diuretics, expectorants, and stimulants. A red-bulb variety yields a substance used in rat poison.

Squill is Urginea maritima of the hyacinth family, Hyacinthaceae.

For a genus of plants sometimes called squill,