From BiblePortal Wikipedia

Webster's Dictionary [1]

(1): (n.) A native or inhabitant of Chaldea.

(2): (a.) Of or pertaining to Chaldea.

(3): (n.) A learned man, esp. an astrologer; - so called among the Eastern nations, because astrology and the kindred arts were much cultivated by the Chaldeans.

(4): (n.) Nestorian.

King James Dictionary [2]

Chaldean, n. An inhabitant of Chaldea.