Definition of plicae:
(n) :
A fold or crease, especially of skin or other tissue.
(n) :
Polish plait, plica polonica, or plica neuropatica: a disease of the hair in which it becomes twisted and matted together.
(n) :
(botany) A diseased state in plants in which there is an excessive development of small entangled twigs, instead of ordinary branches.
(n) :
(zoology) The bend of the wing of a bird.
(n) :
(music) A neume, in the form of a tail at the end of a ligature, indicating an additional note.