Inflammation of the ethmoid bone (a small bone in the nasal cavity), particularly affecting its innermost or deepest portions.
From Greek 'eso-' (innermost) plus 'ethmoid' (from Greek 'ethmos,' sieve, because the bone is full of holes) plus '-itis' (inflammation). The term precisely targets inflammation of this delicate facial bone.
The ethmoid bone is called the 'sieve bone' because it's riddled with tiny holes—infections here are serious because germs are millimeters from your brain, so having a specific medical term matters for treating it correctly.
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