Schoolmaster (παιδαγωγός)
Concise Bible Dictionary:
This is literally “child conductor,” pedagogue: originally a slave who took his master’s children to school. The law was a schoolmaster to the Jews (not to the Gentiles: Paul said we, in contrast to ye in Gal. 3:26) until Christ came; but any led to Christ were no longer under that schoolmaster (Gal. 3:24-25; compare Rom. 6:14).