Easton's Bible Dictionary

(Dan. 1:20; 2:2, 10, 27, etc.) Hebrews `ashshaph', an enchanter, one who professes to divine future events by the appearance of the stars. This science flourished among the Chaldeans. It was positively forbidden to the Jews (Deuteronomy 4:19; 18:10; Isaiah 47:13).

Noah Webster's New International Dictionary of the English Language

1. (n.) One who studies the stars; an astronomer.

2. (n.) One who practices astrology; one who professes to foretell events by the aspects and situation of the stars.