. noun archaeoastronomy; the study of the astronomy of ancient cultures; also written astro-archaeology Usage Note science
(not in technical use) exobiology. noun the branch of biology that investigates the possibility of life elsewhere in the universe n. 1903, from French astrobiologie; see astro- + biology. Related: Astrobiological; astrobiologist. astrobiology (ās’trō-bī-ŏl’ə-jē) See exobiology.
astroblast astroblast as·tro·blast (ās’trə-blāst’) n. 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.