papilla

noun

1. A vascular process of connective tissue extending into and nourishing the root of a hair, feather, or developing tooth see hair
2. Any of the vascular protuberances of the dermal layer of the skin extending into the epidermal layer and often containing tactile corpuscles
3. Any of the small protuberances on the upper surface of the tongue often containing taste buds

noun

1. The apex of a renal pyramid which projects into the cavity of a calyx see calyx of the kidney and through which collecting ducts discharge urine