covercle

from The Collaborative International Dictionary of English v.0.48

Covercle \Cov"er*cle\ (k?v"?r-k'l), n. [OF. covercle, F.
   couvercle, fr. L. cooperculum fr. cooperire. See {cover}]
   A small cover; a lid. [Obs.] --Sir T. Browne.
   [1913 Webster]