Lavatory vs. Piscina

A vessel or fixture for washing, particularly:

A laver: a washbasin.

(archaic) A bathtub.

(Christianity) A piscina: the basin used for washing communion vessels.

(Christianity) A lavabo: the basin used for washing one's hands before handling the Eucharist.

A baptismal font: the basin used for baptism, used figuratively for the washing away of sins.

A plumbing fixture used for washing: a sink.

Example: ‘Their 'bathroom' included a toilet and a lavatory but no bath.’;

Handwashing, particularly

(Christianity) The lavabo: the ritual washing of hands before handling the eucharist.

(Christianity) The ritual washing of hands after using the piscina to clean the communion vessels.

(obsolete) A liquid used in washing; a lotion; a wash; a rinse.

(dated) A washroom: a room used for washing the face and hands.

(euphemism) A room containing a toilet: a bathroom US or WC UK.

Example: ‘Americans don't know 'WC' and Brits mock 'bathroom' but everyone usually understands 'toilet' or 'lavatory'.’;

A plumbing fixture for urination and defecation: a toilet.

(dated) A place to wash clothes: a laundry.

(obsolete) A place where gold is panned.

(obsolete) A paved room in a mortuary where corpses are kept under a shower of disinfecting fluid.

(dated) Washing, or cleansing by washing.

Washing, or cleansing by washing.

A place for washing.

A basin or other vessel for washing in.

A wash or lotion for a diseased part.

A place where gold is obtained by washing.

A room containing one or more sinks for washing, as well as one or more toilet fixtures; also called bathroom, toilet, and sometimes commode. Commode and toilet may refer to a room with only a toilet fixture, but without a sink.

a room equipped with toilet facilities

a bathroom or lavatory sink that is permanently installed and connected to a water supply and drainpipe; where you wash your hands and face;

Example: ‘he ran some water in the basin and splashed it on his face’;

a toilet that is cleaned of waste by the flow of water through it

a room, building, or cubicle containing a toilet or toilets

Example: ‘he locked himself in the downstairs lavatory’; ‘public lavatories’;

a flush toilet

Example: ‘she flushed the lavatory’; ‘I needed to go to the lavatory’;

a sink or washbasin in a bathroom or toilet.

A drained basin near a church's altar for the disposal of water from liturgical ablutions.

A basin or tank, especially one for holding fishes or for growing aquatic plants.

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

A piscina is a shallow basin placed near the altar of a church, or else in the vestry or sacristy, used for washing the communion vessels. The sacrarium is the drain itself.