astroblast as·tro·blast (ās’trə-blāst’)
A primitive cell that develops into an astrocyte.
an erosional scar on the earth’s surface, produced by the impact of a cosmic body, as a meteorite or asteroid. Compare (def 2). noun a mark on the earth’s surface, usually circular, formed by a large ancient meteorite impact n. 1961, from astro- + Greek bleme “throw of a missile; wound caused by a missile,” […]
astroblastoma astroblastoma as·tro·blas·to·ma (ās’trō-blā-stō’mə) n. A poorly differentiated tumor composed of astrocytes and arranged radially with short fibrils terminating on small blood vessels. Also called grade II astrocytoma, grade III astrocytoma.
noun the branch of botany that investigates the possibility that plants grow on other planets
a branch of astronomy and dealing with the chemical composition and evolution of the universe and its parts. noun the study of the chemistry of celestial bodies and space, esp by means of spectroscopy