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noun, plural pap·u·lae [pap-yuh-lee] /ˈpæp yəˌli/.
  1. one of the small, ciliated projections of the body wall of an echinoderm, serving for respiration and excretion.

Origin of papula

1700–10; < New Latin, Latin: pimple, pustule. See papule Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018