{"era":"current","word":"astronomer","meaning":"a person who studies celestial bodies and the universe","children":[{"era":"late 14th c.","word":"astronomy","meaning":"the study of the stars and planets","children":[{"era":"classical","word":"astronomia","meaning":"astronomy","children":[{"era":"classical","word":"astronomos","meaning":"star-regulating; astronomer","children":[{"era":"classical","word":"astron","meaning":"star","children":[],"language":"Ancient Greek"},{"era":"classical","word":"nomos","meaning":"arranging; law","children":[],"language":"Ancient Greek"}],"language":"Ancient Greek"}],"language":"Latin"}],"language":"Middle English"},{"era":"late 14th c.","word":"-er","meaning":"agent noun suffix","children":[],"language":"Middle English"}],"language":"Modern English"}