English word papilla comes from Latin papula ((medicine) pustule, pimple. Mote.)

Detailed word origin of papilla

Dictionary entry	Language	Definition
papula	Latin (lat)	(medicine) pustule, pimple. Mote.
papilla	Latin (lat)	(anatomy) nipple, teat, breast, papilla.
papilla	English (eng)	(anatomy) A nipple-like anatomical structure.