Which description refers to a lavatory in plumbing?

A lavatory is specifically defined within plumbing terminology as a hand basin typically found in a bathroom. This type of sink is designed for personal hygiene purposes, such as washing hands and face. It is an essential fixture in residential and commercial bathroom settings, emphasizing comfort and convenience.

Choosing the option that refers to a hand basin in a kitchen or one used for food preparation would be incorrect, as those types of sinks serve different functions and are categorized differently. Similarly, a portable washing station does not meet the specific requirements or definitions associated with a lavatory in bathroom settings. Thus, the description that accurately encapsulates the essence of a lavatory, focusing on its location and intended use, is the identification as a hand basin typically found in a bathroom.