Papillary (adjective)

1. Relating to or resembling a nipple or teat, especially in being small and round.
2. Having or characterized by small, finger-like projections, especially in the lining of certain internal organs.
3. Of, relating to, or having the form of small nipple-like projections or protuberances.

Origin:

The word 'papillary' is derived from the latin word 'papilla' meaning 'nipple'. the term was first used in anatomy and physiology to describe the small, nipple-like projections found in certain parts of the body.

Examples:

1. The surface of the brain was covered with papillary ridges, which are thought to increase its surface area.
2. The papillary muscles of the heart are small, finger-like projections that help regulate the flow of blood.
3. The skin on the sole of the foot is covered with papillary ridges, which help provide grip and traction.
4. The papillary layer of the epidermis is the uppermost layer, where new skin cells are formed.
5. The papillary structure of the tongue helps increase its surface area and make it more sensitive to touch.