Piscina

·noun A niche near the altar in a church, containing a small basin for rinsing altar vessels.

piscina
piscīna, ae, f. [piscis], a pond in which fish are kept, a fish-pond. I Lit.: piscinarum genera sun...

A New Latin Dictionary by Charlton T. Lewis Ph.D. and Charles Short, LL. D.
piscina
piscīna ae, f piscis, a fish-pond , C.: publica, the public fish-pond , L. ...

An Elementary Latin Dictionary