One layer at a time.

nonstandard form of laid up.

(archaic) simple past tense and past participle of lay

(computing, humorous) The user.

plural of surface boundary layer

The quality of having layers.

(networking) Any of the seven layers of abstraction in the OSI model of communications systems

(anatomy) The deepest layer of the epidermis

(embryology) A collection of cells assembled during embryogenesis that eventually develop into all tissues and organs via organogenesis in animals.

plural of abscission layer