Letter E

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 ethmoid bone

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