"knowledge of the fixed stars, their names, magnitudes, etc.," 1835, from astro- "star" + -gnosy, from Greek gnōsis "a knowing, knowledge," from PIE root *gno- "to know."
astride
astringent
astro-
astrobiology
astrobleme
astrognosy
astrography
astroid
astrolabe
astrolatry
astrologer
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