Easton's Bible Dictionary (1897)
Chamberlain to king Herod Agrippa I. (Acts 12:20). Such persons generally had great influence with their masters.
Smith's Bible Dictionary (1863)
(sprout), the chamberlain of Herod Agrippa I. (Acts 12:20)
Hastings' Dictionary of the Bible (1898) & Schaff's Bible Dictionary
BLAS'TUS (sprout), the chamberlain of Herod Agrippa I. Acts 12:20.
Hitchcock's Bible Names (1869)
that buds or brings forth