Sieve cells

from The Collaborative International Dictionary of English v.0.48
Sieve \Sieve\, n. [OE. sive, AS. sife; akin to D. zeef, zift,
   OHG. sib, G. sieb. [root]151a. Cf. {Sift}.]
   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. "In a sieve thrown and sifted." --Chaucer.
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   2. A kind of coarse basket. --Simmonds.
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   {Sieve cells} (Bot.), cribriform cells. See under
      {Cribriform}.
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