The combining form of the Greek word
n. exobiology; -- not used technically.
n. the branch of science involving astronomy and chemistry which studies the chemical composition, chemical reactions, and evolution of matter in outer space. --
n. a large star-shaped neuroglial cell in nervous tissue. [ PJC ]
n. a tumor of nervous tissue derived from interstitial cells, in which the cells are relatively well-differentiated and resemble astrocytes. The occur primarily in the crebrum and cerebellum. Stedman [ PJC ]
n. [ Astro- + Gr. &unr_; birth. ] The creation or evolution of the stars or the heavens. H. Spencer. [ 1913 Webster ]
n. [ Astro- + Gr. &unr_; knowledge. ] The science or knowledge of the stars, esp. the fixed stars. Bouvier. [ 1913 Webster ]
n. Same as Astrogeny. --
n. [ Astro'cf + -graphy. ] The art of describing or delineating the stars; a description or mapping of the heavens. [ 1913 Webster ]