A Lap

1. The loose part of a coat; the lower part of a garment that plays loosely; a skirt; an apron.
2. An edge; a border; a hem, as of cloth.
3. The part of the clothing that lies on the knees or thighs when one sits down; that part of the person thus covered.
4. (figuratively) a place of rearing and fostering
5. The upper legs of a seated person.
6. (archaic, euphemistic) The female pudenda. [17th century]
7. (construction) A component that overlaps or covers any portion of itself or of an adjacent component.