piscina

noun, plural pis·ci·nae [pi-sahy-nee, pi-see-] /pɪˈsaɪ ni, pɪˈsi-/. Ecclesiastical.

1. a basin with a drain used for certain ablutions, now generally in the sacristy.

noun plural -nae (-niː) or -nas

1. RC Church a stone basin, with a drain, in a church or sacristy where water used at Mass is poured away