1. A specialized structure, such as inflated stems, used by ant plants for the housing of ant colonies: Domatia are tiny chambers produced by plants that house arthropods.

Domatia differ from galls in that they are produced by the plant rather than being induced by their inhabitants.

Ant domatia are inhabited by ants in what is considered to be a mutualist relationship between the ants and the plants.
2. Etymolgy: from Latin domus, "home".