noun, plural pli·cae [plahy-see, -kee] /ˈplaɪ si, -ki/.
  1. Zoology, Anatomy. a fold or folding.
  2. Also called pli·ca po·lon·i·ca [puh-lon-i-kuh] /pəˈlɒn ɪ kə/. Pathology. a matted, filthy condition of the hair, caused by disease, vermin, etc.
  3. (in medieval music) a vertical mark attached to a neume, standing for an interpolated melodic ornament.

Origin of plica

1675–85; < Medieval Latin: a fold, back formation from Latin plicāre to fold, ply2
Related formspli·cal, adjective Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for plicae


noun plural plicae (ˈplaɪsiː)
  1. Also called: fold anatomy a folding over of parts, such as a fold of skin, muscle, peritoneum, etc
  2. pathol a condition of the hair characterized by matting, filth, and the presence of parasites
Derived Formsplical, adjective

Word Origin for plica

C17: from Medieval Latin: a fold, from Latin plicāre to fold; see ply ²
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

plicae in Medicine


n. pl. pli•cae (-kē)
  1. A fold or ridge, as of skin or membrane.
  2. false membrane
Related formsplical adj.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.