Baptisterium Explained

In classical antiquity, a baptisterium (Greek, Ancient (to 1453);: βαπτιστήριον) was a large basin installed in private or public baths into which bathers could plunge, or even swim about.^[1] It is more commonly called natatorium or piscina.

Notes and References

1. Epist. ii. 17, 11 (cited by Peck)