Sieve /(?)/

Sieve

n.
  1. A utensil for separating the finer and coarser parts of a pulverized or granulated substance from each other. It consist of a vessel, usually shallow, with the bottom perforated, or made of hair, wire, or the like, woven in meshes.
  2. A kind of coarse basket.

Phrases & Compounds
Sieve cells
cribriform cells. See under Cribriform.