ect·ethmoid I. \(ˈ)ek|t+_-\noun Etymology:ect- + ethmoid, n. : either of two lateral parts of the ethmoid bone lying on either side of the mesethmoid and forming part of the anterior wall of the orbit II. adjective alsoect·ethmoidal\(|)ek|t+_-\; alsoec·to·ethmoid\|ektō+\ : lateral or external to the ethmoid