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Ethmoid

a.
  1. Like a sieve; cribriform.
  2. Pertaining to, or in the region of, the ethmoid bone.
    3. Ethmoid bone (Anat.),
    a bone of complicated structure through which the olfactory nerves pass out of the cranium and over which they are largely distributed.

n.
  1. The ethmoid bone.