astrology comes from Latin astrologia, from Ancient Greek astrología ('telling of the stars'), from astron ('star') + -logia ('study, account'). Morphologically, the word is transparent: -logia is attached to the older base named in the history, so the modern form packages an inherited or borrowed stem inside a later English derivative. In modern use, the noun sense is "the study of how the positions of stars and planets supposedly influence human affairs", which keeps the etymology connected to the word's present dictionary value rather than treating it as a merely historical label. The wider word family includes related English forms such as astronomy, astral, asterisk, disaster and derivatives such as astrologer, astrological, astrologically, showing how the same base continues to support neighboring English vocabulary. The principal historical forms in the chain include Ancient Greek astrología, Ancient Greek astron, Proto-Indo-European *h₂stḗr, which anchor the explanation in named linguistic material.