a U -shaped ridge at the base of the posterior surface of the crown of a tooth.
- Basal rod
basal rod basal rod n. See costa. Historical Examples But in the Eutympanida both rings exhibit one simple gate only, the apical and the basal rod of the sagittal ring being lost. Report on the Radiolaria Collected by H.M.S. Challenger During the Years 1873-1876, Second Part: Subclass Osculosa; Index Ernst Haeckel The distance of the […]
the dark, dense igneous rock of a lava flow or minor intrusion, composed essentially of labradorite and pyroxene and often displaying a columnar structure. Contemporary Examples Somewhere in the basalt hills a lion roared, the sound carrying through the night until another responded. Borana Joins the Fight to Save Kenya’s Rhinos…and Wants You to Help […]
- Basal vein
basal vein basal vein n. A large vein passing caudally and dorsally along the medial surface of the temporal lobe and emptying into the great cerebral vein from the lateral side.
- Basal-cell nevus syndrome
basal-cell nevus syndrome basal-cell nevus syndrome n. An inherited syndrome marked by the presence of numerous basal-cell carcinomas of the skin, cysts of the jawbones, erythematous pitting of the palms and soles, and often skeletal anomalies. Also called Gorlin’s syndrome.