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The ethmoid bone.

Pertaining to, or in the region of, the ethmoid bone. 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.

Pertaining to expansions of the ethmoid bone or

External to the ethmoid; prefrontal.

Of or pertaining to the middle of the ethmoid region or ethmoid bone. -- n. (Anat.)

Near or beside the ethmoid bone or cartilage; -- applied especially to a pair of bones in the nasal region of some fishes, and to the ethmoturbinals in some higher animals. -- n.

Of or pertaining to both the sphenoidal and the ethmoidal regions of the skull, or the sphenethmoid bone; sphenethmoidal. Sphenethmoid bone (Anat.), a bone of the skull which surrounds the anterior end of the brain in many amphibia; the girdle bone.

Relating to the sphenoethmoid bone; sphenoethmoid.

Sphenethmoid.

Above, or on the dorsal side of, the ethmoid bone or cartilage.

ling, or having the form of, a sieve; pierced with hokes; as, the cribriform plate of the ethmoid bone; a cribriform compress. Cribriform cells (Bot.), those which have here and there oblique or transverse sieve plates, or places perforated with many holes.

Pertaining to the region of the vomer and the base of the ethmoid in the skull. Ethmovomerine plate (Anat.), a cartilaginous plate beneath the front of the fetal brain which the ethmoid region of the skull is developed.

The clitellus of an earthworm. Girdle bone (Anat.), the sphenethmoid. See under Sphenethmoid. -- Girdle wheel, a spinning wheel. -- Sea girdle (Zoöl.), a ctenophore. See Venus's girdle, under Venus. -- Shoulder, Pectoral, and Pelvic, girdle. (Anat.) See under Pectoral, and Pelvic. -- To have under the girdle, to ha…

Situated in front of the frontal bone, or the frontal region of the skull; ectethmoid, as a certain bone in the nasal capsule of many animals, and certain scales of reptiles and fishes. -- n.

A bone, or one of a pair of bones, beneath the ethmoid region of the skull, forming a part a part of the partition between the nostrils in man and other mammals.