Easton's Bible Dictionary (1897)
A “prophet,” probably one of the seventy disciples of Christ. He prophesied at Antioch of an approaching famine (Acts 11:27, 28). Many years afterwards he met Paul at Caesarea, and warned him of the bonds and affliction that awaited him at Jerusalem should he persist in going thither (Acts 21:10-12).
Smith's Bible Dictionary (1863)
(a locust), a Christian prophet in the apostolic age, mentioned in (Acts 11:28) and Acts 21:10 He predicted, (Acts 11:28) that a famine would take place in the reign of Claudius. Josephus mentions a famine which prevailed in Judea in the reign of Claudius, and swept away many of the inhabitants. (In (Acts 21:10) we learn that Agabus and Paul met at Caesarea some time after this.)
Hastings' Dictionary of the Bible (1898) & Schaff's Bible Dictionary
AG'ABUS (possibly locust), a prophet who foretold in Antioch while Paul and Barnabas were there, A. D. 43. Acts 11:28. A famine took place the following year. It was probably limited to Judaea, where it was severe. The poor Jews were relieved by Helena, the queen of Adiabene, who bought corn for them out of Alexandria. Aid was sent to the Christians in Jerusalem from Antioch. Acts 11:29. Many years after, Agabus met Paul at Cesarea, and warned
him of the sufferings he would endure if he went to Jerusalem. Acts 21:10.
Hitchcock's Bible Names (1869)
a locust; the father's joy or feast