In the Vedic usage, another meaning of the term ‘āgrayaṇa'(agrayana) is also found. The āgrayaṇa-sthālī (agrayana-sthali, the container of agrayana) is a container for keeping somarasa (the nectre-like drink prepared from a vine called soma). The soma -liquor is divided in three portions, and two of these portions are kept in other two containers. The rest of the soma-liquor remains in the first container, so it is called the āgrayaṇa-sthālī.
[Kātyāyana Śrautasūtra (Thite) 10.1.13]