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A mineral found usually in thin, wedge-shaped crystals of a yellow or green to black color. It is a silicate of titanium and calcium; titanite.

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.

A luminous impression produced through excitation of the retina by some cause other than the impingement upon it of rays of light, as by pressure upon the eyeball when the lids are closed. Cf. After- image.

A median process on the front part of the neural arch of the vertebræ of most snakes and some lizards, which fits into a fossa, called the zygantrum, on the back part of the arch in front.

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…

the eye, in which the patient perceives luminous rays, flashes, coruscations, etc. See phosphene.

Sphenethmoid.

See Sphene.

An elementary substance found combined in the minerals manaccanite, rutile, sphene, etc., and isolated as an infusible iron- gray amorphous powder, having a metallic luster. It burns when heated in the air. Symbol Ti. Atomic weight 48.1.

See under Zygosphene.