zapatera

from The Collaborative International Dictionary of English v.0.48

Zapatera \Za`pa*te"ra\, n. [Sp. aceituna zapatera.] (Olive
   trade)
   A cured olive which has spoiled or is on the verge of
   decomposition; loosely, an olive defective because of
   bruises, wormholes, or the like.
   [Webster 1913 Suppl.]