from
The Collaborative International Dictionary of English v.0.48
Plica \Pli"ca\, n. [LL., a fold, fr. L. plicare to fold. See
{Ply}, v.]
1. (Med.) A disease of the hair (Plica polonica), in which it
becomes twisted and matted together. The disease is of
Polish origin, and is hence called also {Polish plait}.
--Dunglison.
[1913 Webster]
2. (Bot.) A diseased state in plants in which there is an
excessive development of small entangled twigs, instead of
ordinary branches.
[1913 Webster]
3. (Zool.) The bend of the wing of a bird.
[1913 Webster] Plicate