
1) Bone 2) Ethmoid bone
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https://www.crosswordclues.com/clue/ethmoid

of or like a sieve
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• (a.) Alt. of Ethmoidal • (n.) The ethmoid bone.
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http://thinkexist.com/dictionary/meaning/ethmoid/

(eth´moid) sievelike; cribriform. ethmoid bone.
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Eth'moid noun (Anat.) The ethmoid bone.
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http://www.encyclo.co.uk/webster/E/70

Type: Term Pronunciation: eth′moyd Synonyms: os ethmoidale See: ethmoid bone
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http://www.medilexicon.com/medicaldictionary.php?t=30575

Ethmoid: 1. As an adjective: spongy or sievelike. From the Greek ethmos, sieve + eidos, resemblance = like a sieve. 2. As a noun; short for the ethmoid bone, a spongy bone that serves as the front floor of the skull and the roof of the nose. 3. As a noun: short for the ethmoid sinus, which is made up of numerous thin-walled air cells within the eth...
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[
n] - one of the eight bones of the cranium
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http://www.webdictionary.co.uk/definition.php?query=ethmoid

ethmoid 1. A short term for the spongy or sievelike ethmoid bone, a spongy bone that serves as the front floor of the skull and the roof of the nose. 2. Another short term for the ethmoid sinus, which is made up of numerous thin-walled air cells within the ethmoid bone. 3. Relating to, or being a light spongy bone located between the orbits, form...
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ethmoid bone noun one of the eight bones of the cranium; a small bone filled with air spaces that forms part of the eye sockets and the nasal cavity
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https://www.encyclo.co.uk/local/20974

adjective, Greek ethmos = sieve, and eidos = shape or form, hence, like a sieve; an unpaired skull bone.
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https://www.encyclo.co.uk/local/21450
No exact match found.